a would be the answer because protista were the first to be on earth and they had eye spots which could they could barely see out of and then their eyes evolved along with their body and everything but the answer was a
The first life-forms on Earth were likely simple single-celled organisms known as prokaryotes, existing over 3.5 billion years ago, well before the advent of complex multicellular organisms and the Cambrian Explosion that led to a significant increase in life's complexity. Hence the correct option is A.
The First Forms of Life on Earth
These early life forms are believed to be prokaryotes, which are organisms without a nucleus or other membrane-bound organelles. This precedes the later development of more complex life, like multicellular organisms which appeared much later in Earth's history. The first multicellular organisms, such as sponges, had specialized cells but were still far simpler than the complex multicellular organisms we see today. Fossil records suggest that the earlier life forms likely resembled modern-day bacteria in size and simplicity. As for the progression of life, it is broadly accepted that life on Earth started as single-celled, simple organisms, which then evolved over billions of years into a diverse array of complex organisms we have today. This evolutionary process is thought to have begun around 3.5 to 4 billion years ago, and the first multicellular life didn't appear until about 610 million years ago, leading up to the Cambrian Explosion of evolution which expanded life's complexity significantly.
Circle All words that correctly apply to/describe hemoglobin:
(A.) protein
(B.) carbohydrate
(C.) composed of amino acid
(D.) chemical molecules
(E.) composed of DNA.
(F.) composed of RNA
(G.) carries O2 through the bloodstream
Hemoglobin, found in red blood cells, is a protein made up of four subunits and heme groups that bind oxygen, allowing it to transport oxygen throughout the bloodstream.
Explanation:Hemoglobin is a protein found inside red blood cells and is responsible for carrying oxygen (O2) to cells and carbon dioxide (CO2) to the lungs. It is made up of four symmetrical subunits and four heme groups that contain iron, which binds oxygen. The presence of iron gives blood its characteristic red color. Hemoglobin's structure includes two alpha subunits and two beta subunits, each of which can bind to an oxygen molecule, allowing the entire hemoglobin molecule to carry up to four oxygen molecules.
Which of the following types of nonrenewable fuel sources requires the storage of radioactive waste?
A. Coal
B. Oil
C. Solar
D. Nuclear
Answer: D. nuclear
Explanation:
Nuclear types of nonrenewable fuel sources requires the storage of radioactive waste, hence option D is correct.
Uranium is a nonrenewable energy source that may be used to divide its atoms into heat and eventually electricity through a process known as nuclear fission.
The element uranium is the one that is most frequently employed in nuclear power reactors. Nuclear power plants typically employ U-235, a highly uncommon form of uranium.
A non-renewable resource is uranium. Around the world, generating power via nuclear energy is a common practice.
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How does the process of gel electrophoresis separate DNA fragments?
DNA is negatively charged due to its phosphate groups. Gel electrophoresis has one side that is positive and other that is negative. Once dna fragments are placed inside. The bigger fragments will move towards the positive side since positive is attracted to negative.
Answer:
For the separation of DNA fragments we use gel electrophoresis.
Explanation:
Since DNA fragments are negatively charged molecules they can be separated by forcing them to move towards the positive electrode anode under an electric field through a medium or matrix. The most common matrix is agarose. The DNA fragments separate according to their size through sieving effect provided by the agarose gel. Hence, the smaller the fragment size, the farther it moves. The separated DNA fragments can be visualized only after staining the DNA with a compound known as ethidium bromide followed by exposure to UV radiations. You can see the bright orange colored bands of DNA in a ethidium bromide stained gel exposed to UV light.
The sequence of ________________ in a DNA molecule determines the protein that will be produced. A) lipids B) nucleotides C) proteins D) sugars
B) Nucleotides
Hope this helps and have a great day :)
The answer is B good day :)
Which do scientists link to increase hurricane strength
Scientists link increased hurricane strength with the help of both multi-natural cycles as well as warm ocean water from global warming.
What is global warming?Global warming is defined as the long-term warming of the planet's overall temperature. Though this global warming trend has been going on for a long time, it has significantly raised in the last hundred years due to the burning of fossil fuels. As the human population has increased in large amounts, so has the volume of fossil fuels burned.It is caused by raised concentrations of greenhouse gases in the atmosphere, mainly from human works such as burning fossil fuels, and farming.Overall, glaciers are melting at a faster rate with temperature. Sea ice in the Arctic Ocean around the North Pole is melting faster with the cold temperatures.To learn more about global warming refer to:
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Which of the following physical features is most likely a result of inheritance?
A.
A diseased plant has fewer branches and leaves than a healthy plant.
B.
A man has very large muscles and his son is thin with no large, developed muscles.
C.
A plant in a nutrient-rich area is taller than a plant that is in a nutrient-deprived area.
D.
A human newborn has type O blood, and its mother also has type O blood.
D because just like you can inherit your hair and eye color from your parents so can you inherit your parents blood type
Answer:
D. A human newborn has type O blood, and its mother also has type O blood.
Explanation:
Heredity, or genetic inheritance, is a biological mechanism for transmitting characteristics from one individual to another (from parent to child specifically). The "bridge" that transmits such information is the gene, so everything happens in a genetic process.
Heredity is one of the foundations of genetics, a branch of biology that studies how biological inheritance occurs. This is how certain characteristics that differentiate a group are transmitted from one individual to another. A typical example of this phenomenon are the characteristics you have in common with your parents, such as eye color, hair texture, blood type and others.
What uses technology to replace one or more genes in an organism?
A. genetic technology
B. genetic manufacturing
C. genetic engineering
D. genetic production
Final answer:
The technique that uses technology to replace one or more genes in an organism is known as genetic engineering. It employs recombinant DNA technology to create desirable traits in organisms, leading to the production of GMOs.
Explanation:
Genetic Engineering
The use of technology to replace one or more genes in an organism is called genetic engineering. This process involves the alteration of an organism's genotype using recombinant DNA technology to modify the organism's DNA to achieve desirable traits. Genetic engineering is a key component of biotechnology, which changes the genetic makeup of living things to produce useful products. Genetically modified organisms (GMOs), such as herbicide-resistant soybeans and borer-resistant corn, have become common in various industries, including agriculture and food production.
A company wants to start a nuclear power plant as a way to produce clean energy. They want to use the same reaction that's used in thermonuclear weapons. Which of the following explains why this is not possible?
A. The energy in nuclear fission produces chemicals that harm the environment.
B. The energy in nuclear fusion can't be generated in a controlled manner.
C. The energy in nuclear fusion is too small to generate electricity.
D. The energy in nuclear fission burns out as soon as it's produced.
Please don't guess, try to give the right answer
Hey! I took the Penn foster exam, and i answered (a). I got it wrong, so I tried to find the correct answer. I’m pretty sure the answer is (b), and here’s some text from the Penn foster lesson.
“Unfortunately, nuclear fusion can't be used in nuclear power plants as the energy required to start a fusion is very large. The energy required to start a fusion reaction cannot be generated in a controlled manner.”
Anyways, hope this helps:) If this is wrong, please comment and tell me the correct answer.
Describe why an enzyme is specific.
Answer:Enzymes are highly selective catalysts, meaning that each enzyme only speeds up a specific reaction. ... The molecules that an enzyme works with are called substrates. The substrates bind to a region on the enzyme called the active site. There are two theories explaining the enzyme-substrate interaction.
Explanation:
.
An enzyme has a specific shape for the substrate it’s meant to break down; it only fits that substrate to break it down into the final product. Ex. Lactase (Enzyme breaks down Lactose (substrate) into Glucose and Galactose.
Station 1! Help pls!
1. Which of the following groups has the largest number of different organisms?
A. Family
B. Class
C. Kingdom
D. Domain
2. Which of the following is not one of the three domains?
A. Archaea
B. Phylum
C. Eukarya
D. Bacteria
3. Which of the following groups contain organisms that are most closely related?
A. Species
B. Class
C. Genus
D. Order
4. Organisms are called by their scientific name, which consists of their ____ and ____.
A. Genus; Species
B. Order; Family
C. Class; Family
D. Species; Kingdom
Answer:
1. D
2. B
3. A
4. A
Final answer:
The D. domain contains the largest diversity of organisms, B. Phylum is not a domain, species are the most closely related organisms, and the scientific name of an organism consists of its A. Genus and Species.
Explanation:
In biological classification, the hierarchy of categories from most inclusive to most specific is: domain, kingdom, phylum, class, order, family, genus, and species. The answers to the questions presented are as follows:
Domain is the classification group with the largest number of different organisms.Phylum is not one of the three domains; the three domains are Bacteria, Archaea, and Eukarya.The group that contains organisms that are most closely related is Species.Organisms are called by their scientific name, which consists of their Genus and Species.The binomial nomenclature is the system of nomenclature in which each species is given a unique name that consists of two parts, the generic name (genus) and the specific name (species).
Chemical weathering ___.
A) is caused by freezing and thawing
B) breaks apart rocks by physical processes
C) occurs when chemical reactions dissolve or change the minerals in rocks
D) none of the above
Answer:
C
Explanation:
When Chemical Weathering occurs the rain water reacted with the mineral grains in rocks by forming new minerals, called clays and forming as well, soluble salts.
The answer is C. because the erosion or disintegration of rock, building materials, cause by chemical reactions(chiefly with water and substance dissolved in it) rather than by mechanical processes.
the liver of dog has been found to have a higher than normal cell death because of dna is damaged. what part of the cell failed to do its job of protecting the dna of cell
Answer:
The Nucleus.
Explanation:
The nucleus is surrounded by a membrane called the nuclear envelope, which protects the DNA.
Answer:
Nuclear envelop
Explanation:
Nuclear envelop is the double membrane structure that makes the boundary of the nucleus. It serves to protect the DNA from the toxins, wastes and other harmful substances produced during metabolic reactions of the cell occurring in cytoplasm.
If the nuclear envelope does not protect DNA, DNA could be damaged by free radicals or toxins. A cell with damaged DNA is subjected to death.
how would you use red, blue, and yellow marbles to model a carbon atom
I attached a picture showing how to do it
Answer:
The correct answer is - arrange yellow and blue in the center as proton and neutron while red as electrons revolving in a different shell.
Explanation:
The carbon atom has 6 protons and 6 neutrons present in the nucleus of the atom while 6 electrons present in the shell. The inner shell has two and the outer most shell has 4 electrons.
One can represent all three color balls as an electron, proton, and neutron to model the carbon atom.
5)
All the plants grown from a given type of genetically engineered seed are genetically identical. On the one had, uniformity can make it easier for a farmer to manage the crops. Which is the best reason why the loss of genetic variation is an environmental concern?
Hi!
If there isn't genetic variation, every identical copy of the organism has the same immunity to a disease. If a disease that they don't have immunity to comes, they will all die.
Hope this helps!
A. primary succession after a controlled fire
B. primary succession after a volcanic eruption
C. secondary succession after a controlled fire
D. secondary succession after a volcanic eruption
primary succession after a volcanic eruption
Answer is B.
The picture shows primary succession after a volcanic eruption.
What is primary succession?A primary succession occurs when a freshly developed area is populated for the first time by a group of species or a community.Topsoil and organic materials are frequently scarce in this previously deserted, bleak environment. The pioneer species is the species that was the first to colonize an uninhabited area, and the pioneer community is the dominant community. Primary succession may occur, for example, following the eruption of volcanoes such as those on Hawaii's Big Island. New rock is produced as lava flows into the water.learn more about primary succession here:
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What is plant respiration in simple terms? (Cellular respiration)
Answer:
Cellular respiration is the process of breaking sugar down into a form that the cell can utilize as energy.
Explanation:
This happens in all types of life. Cellular respiration takes in food and uses it to produce ATP, a chemical which the cell uses for energy. Typically, this process uses oxygen and is known as aerobic respiration.
I hope this was helpful!
The jones family gas had their dog, Sadie since she was a puppy. Sadie was raised in the home, which has a letter carrier visit at the same time ever day. Though Sadie used to bark and scratch the door when the letter carrier deopped off packages, now she doesnt even wake up from her nap when the letter carrier comes. Sadie is demonstrating a learned behavior that she acquired through what method?
a) habituation
b) trial and error
c) imprinting
d) mimicry
please help?
a) due to a learned behavior so habituation
Answer:
a) habituation
Explanation:
Habituation is the adaptive learning behaviour in which the response strength is reduced when stimulus is given repeatedly. Barking and scratching of door by the dog was the response towards arrival of letter carrier. However, repeated visits of the person at the same time reduced the strength of response through the process of habituation.
What cell don't have any membrane bound organelles but they do have a nucleus
A. Dna
B. Prokaryotic
C. Nucleus
Answer:
Dna
Explanation:
The nucleus is surrounded by a membrane. Prokaryotic cells do not have a nucleus
Prokaryotic cell don't have any membrane bound organelles but they do have a nucleus. Thus, the correct option is B.
What is prokaryotic cell?Prokaryotic cells are defined as the cell which single-celled, non bound organelle microorganisms known to be the earliest on earth. Prokaryotes comprises bacteria and archaea.
The photosynthetic prokaryotes comprises cyanobacteria that perform photosynthesis. A prokaryotic cell comprises of a single membrane and hence, all the reactions occur within the cytoplasm. The below diagram shows a prokaryotic cell.
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Area measuring 5 m² contains 50 earthworms what is the population density of the earth worms
The density of a population of living organisms is usually measured in individuals on one square km. In here we have 50 earthworms on an area of 5 square meters, thus we have 10 earthworms on every square meter. In order to get to the result we need to see first how many square meters there are in one square km. One square km has one thousand meters of length and one thousand meters of width so:
1,000 x 1,000 = 1,000,000 km²
Since we established that we have 10 earthworms on every one square meter, we just need to multiply the number of square meters with the amount of earthworms on every square meter:
1,000,000 x 10 = 10,000,000
So we have a density of 10 million earthworms per square km.
Which is a characteristic of pseudoscience
Pseudoscience is characterized by the lack of scientific evidence and reliance on anecdotal or subjective experiences. It lacks the rigor and methodology of a scientific investigation.
Explanation:Lack of scientific support and dependence on anecdotal or subjective experiences are traits of pseudoscience. Let's take the example of someone claiming to have created a medication that will cause you to lose weight without the need for exercise or dietary modifications.
It would be regarded as pseudoscience if there was no scientific study or evidence to back up this assertion and it was only based on the testimonies of a small number of people. Pseudoscience frequently lacks the methodological rigor of a scientific inquiry, making it impossible to verify or duplicate its conclusions.
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Pseudoscience is presented as scientific but does not follow scientific standards and cannot be tested or falsified. An example of pseudoscience is astrology, which lacks experimental backing.
In contrast, legitimate scientific disciplines, such as astronomy, rely on testable and falsifiable theories.
Which characteristics do photosynthesis and
cellular respiration have in common?
Check all that apply.
Photosynthesis and cellular respiration both involve the metabolic pathway of carbohydrates, use electron transport chains for energy capture, and are part of a biological cycle linking the two with the exchange of oxygen, glucose, carbon dioxide, and water.
The characteristics that photosynthesis and cellular respiration have in common include:
Both processes involve the metabolic pathway of carbohydrates to produce energy, with photosynthesis building carbohydrates and cellular respiration breaking them down.
They both utilize an electron transport chain to capture energy necessary for other reactions.
These processes form a cycle where photosynthesis produces oxygen and glucose needed for cellular respiration, while cellular respiration generates carbon dioxide and water, which are inputs for photosynthesis.
Additionally, while photosynthesis occurs in the chloroplasts of plant cells, cellular respiration takes place in the mitochondria of all eukaryotic cells, illustrating that both rely on specialized cell organelles to occur.
In normal humans, sex cells contain the _________ number of chromosomes.
Final answer:
Normal human sex cells contain a haploid number of 23 chromosomes, differing from somatic cells which have a diploid number of 46, divided into 23 pairs.
Explanation:
In normal humans, sex cells contain the haploid number of chromosomes. This means that each sex cell, or gamete, carries a single set of 23 chromosomes, one of which is a sex chromosome. In contrast, the somatic cells of humans (any cell of the body except sperm or egg cells) contain a diploid set, which amounts to 46 chromosomes, making up 23 pairs.
During the process of meiosis, the chromosome number is halved from the diploid to the haploid state to ensure that upon fertilization, the resulting offspring will have the correct diploid number. A normal human karyotype illustrates this balance, showing 22 pairs of autosomes and one pair of sex chromosomes: two X chromosomes in females, and one X and one Y chromosome in males.
What type of blood disorder can be caused by an infection?
hemophilia
sepsis
anemia
lymphoma
Possibly try anemia Many other acute infections, either viral or bacterial can cause anemia
Your answer should be sepsis
Plants absorb nitrogen in the form of nitrate ions and ___ ions
Answer:
ammonium
Explanation:
Plants absorb nitrogen in the form of nitrate ions and ammonium(NH4^+) ions.
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Julia demonstrated the formation of a type of rock. She mixed egg, salt, and herbs and cooked the mixture over a flame. The egg turned into an omelet. The formation of which type of rock did Julia demonstrate?
A.) Eroded rock
B.) Igneous rock
C.) Metamorphic rock
D.) Sedimentary rock
Answer: Option (C)
Explanation: Metamorphic rocks are those rocks that are formed when a pre-existing rock undergoes changes or metamorphism, due to the changing pressure and the temperature condition, and forms a new rock. For example, Quartzite, Marble, Schist and Gneiss. They are also known as the secondary rocks, as they are derived from the previous rock.
In the given condition, Julia mixes the egg with salt and herbs and cooked the mixture over a flame, this is compared to the changing pressure and temperature condition that rock undergoes, and that lead to the formation of her omelette, which is here compared to a metamorphic rock.
Thus, the correct answer is option (C).
Its C, just answering so the other guy can get brainliest <3
Which feature forms at a divergent boundary? rift valley island arc subduction zone collision zone
Rift valley is the feature forms at a divergent boundary,A divergent plate boundary often forms a mountain chain known as a ridge.
What is Rift valley?A rift valley is a linear shaped lowland between several highlands or mountain ranges created by the action of a geologic rift. Rifts are formed as a result of the pulling apart of the lithosphere due to extensional tectonics. The linear depression may subsequently be further deepened by the forces of erosion.Rift valley is the feature forms at a divergent boundary,A divergent plate boundary often forms a mountain chain known as a ridge.
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IM GIVING 25 POINTS AND 5 STAR RATING AND THANKS TO WHOEVER AN ANSWER IS LESS THAN 20 MINUTES PLEASE HELP!!!!!!
Sickle cell anemia is known to run in a family. A pedigree chart for this family is shown below. The parents are shown at the top and from left to right appear as a half-shaded circle next to a half-shaded square. The two are connected by a straight line. Below the parent pair is a vertical straight line connecting to the next row of circles and squares which are the offspring. Starting from left an unshaded square, half-shaded circle, another half-shaded circle, and a completely shaded square are shown. All of these are also connected by a horizontal straight line.
What percentage of the offspring are carriers of the disease but do not have it? (4 points)
0%
25%
50%
100%
Answer:
b
Explanation:
Answer:
25%
Explanation:
what are the advantages of classifying species according to their evolutionary relationships, instead of their physical similarities
Final answer:
Classifying species by evolutionary relationships provides a more accurate reflection of their shared ancestry and genetic heritage, which is essential for understanding the consequences of evolution and for updating classifications with new scientific data.
Explanation:
The advantages of classifying species according to their evolutionary relationships, rather than solely on physical similarities, are numerous. One key advantage is the ability to reflect the species' shared ancestry and evolutionary past. This phylogenetic classification offers a more accurate depiction of how species are related to one another and provides context for their physical and genetic traits. While physical traits can be misleading due to convergent evolution, where unrelated species independently evolve similar features, phylogenetic relationships are based on the genetic heritage that organisms share due to descent from a common ancestor.
what are the main functions of the liver in a jaguar
Answer: performs most metabolic functions of the body
Explanation:
1.it produces proteins with the help of vitamin and therefore helps in blood clotting
2.it breaks down old and damaged blood cells
3.it causes break down of fats and produces energy which is utilized by the body hence it helps in fat metabolism
4.it produces bile and causes excretion of bilirubin ,cholesterol,hormones and drugs.
5.it metabolises proteins and carbohydrates
prairie dogs are rodents that eat nonwoody plants and live in burrows in the expanse of the prairie biome. in which of these other biomes would an animal with similar adaptions live: taiga, tropical rain forest, tundra, or deciduous forest? explain your answer
Answer:
tundra
Explanation:
The tundra is a biome in which there are no large trees, and the ones that are present are small as a typical grass. The majority of the plants are nonwoody ones. The climate is very cold throughout most of the year, so the animals that are able to make borrows are using them for the majority of the year, as it is much warmer below the ground than on the surface. If we take the way of lifestyle the prairie dog has and what it requires, then it will not be weird if an animal with very similar characteristics is found living in the tundra. The basic conditions seem to very similar, so an animal that is prairie dog-like, will only need slight adaptations in order to survive in that environment, mostly thicker fur, and ability to have a long hibernation.