Anton van Leeuwenhoek, using the microscope, was the first to observe bacteria and protozoa.
What is instantaneous speciation?
Answer:
Explanation:
Instantaneous speciation is a type of sympatric speciation which refer to the sudden development of new species from one generation which is isolated reproductively or ecologically from the parent species which has the ability to reproduce and establish new population. It occur by polyploid i.e producing two or three sets of homologues chromosomes.
Which of the following are limiting nutrients ?
Water
Carbon
Nitrogen
Phosphorus
Answer:
Nitrogen and Phosphorus
Explanation:
When the function of a whole ecosystem is limited because of a nutrient , which is present in limited amount, it is called as a limiting nutrient. The organisms uptake water and carbon directly from the environment as it is abundant in nature. The nutrients like nitrogen and phosphorous are present in limited amount and moreover they are not present in the form that can be directly taken up by the organism.
Thus, Nitrogen and Phosphorous are limiting nutrients.
Most animal cell membranes have proteins that pump ______ ions out of the cell and potassium ions into the cell.
Answer:
Sodium
Explanation:
Most cell membranes have protein that pumps sodium ions out of the cell and potassium ions into the cell.
Neutron stars, smaller than white dwarfs, are thought to be remnants of _____.
Answer:
I think it's Supernova Events.
Explanation:
Hope i have helped you!
Elements are___
1 - a chemical substance composed of atoms of two or more different types of atoms
2- substances that are made up of only one type of atom
3- subatomic particles with a positive charge
4- only found on earth
An element in Chemistry is a substance made up of only one type of atom, possessing a unique number of protons in its atomic nucleus. Elements are not limited to earth as they can be found throughout the universe.
Explanation:In Chemistry, an element refers to a type of substance that is made up of only one type of atom, Therefore, the correct answer to your question is the second option: 'substances that are made up of only one type of atom'. This means that each chemical element possesses a unique number of protons, known as its atomic number, in its atomic nucleus. For example, hydrogen is an element and it is made up entirely of hydrogen atoms. On the other hand, water is a compound because it's made from two types of atoms - hydrogen and oxygen. Elements are not specific to Earth and can be found throughout the universe.
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What is life? Plzzzzz
Life is the period between the birth and the death of the organisms during which they perform various cellular activies and functions like growth, reproduction, digestion, excreation, etc.
Answer:
The condition that distinguishes animals and plants from inorganic matter, including the capacity for growth, reproduction, functional activity, and continual change preceding death.
Which of the following foods is the most nutrient dense?
a. 4 oz French fries
b. 4oz baked white potato
C. 4 oz baked sweet potato
d. 4 oz Potato chips
The most nutrient dense food among the provided options is the 4 oz baked sweet potato due to its high levels of beta-carotene, vitamin C, and dietary fiber.
Explanation:Among the options provided (4 oz French fries, 4oz baked white potato, 4 oz baked sweet potato, 4 oz Potato chips), the food that is the most nutrient dense is the 4 oz baked sweet potato. Nutrient density refers to the amount of vitamins, minerals, and other nutrients you get per calorie in the food.
Sweet potatoes are incredibly high in beta-carotene (which your body converts into vitamin A), vitamin C, and dietary fiber among other nutrients. This makes them an excellent example of a nutrient dense food. The other options, such as French fries or potato chips, are often high in unhealthy fats and salts, making them less nutrient dense.
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4 oz baked sweet potato is the most nutrient-dense option mentioned, containing a variety of vitamins and minerals with low calorie content.
Explanation:Of all the options provided, the most nutrient-dense food is the 4 oz baked sweet potato. A nutrient-dense food is one that provides a high amount of vitamins, minerals, and other health-promoting nutrients with relatively few calories. The baked sweet potato contains a rich supply of vitamins such as Vitamin A, C, as well as dietary fiber and potassium. In comparison, French fries and potato chips are typically high in unhealthy fats and sodium, while a white potato, though healthy, does not have as many vitamins or minerals as a sweet potato.
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what did not occur in the Proterozoic eon?
A. The oxygen level increased greatly in the atmosphere
B. The emergence of Eukarya
C. Multi-celled eukaryotic organism began to diversify
D. anaerobic bacteria kept thriving with more oxygen
Answer:
C. Multi-celled eukaryotic organisms began to diversify
Explanation:
The Proterozoic is an eon in which numerous important things occurred. There were multiple organisms that appeared in this eon. They were able to perform the process of photosynthesis which resulted in gradual pilling up of oxygen into the atmosphere, thus changing the composition of the atmosphere, and setting up the terrain for the future development of other organisms. It is an eon though in which there were only single-celled organisms, while the diversification of multi-celled eukaryotic organisms occurred in the next eon, the Phanerozoic.
During the Proterozoic Eon, the increase in atmospheric oxygen from cyanobacterial photosynthesis led to the extinction of many anaerobic bacteria; thus, D ('anaerobic bacteria kept thriving with more oxygen') did not occur in the Proterozoic eon.
The Proterozoic Eon was a period of significant atmospheric changes, including the Great Oxygenation Event (GOE). This event was characterized by the rise in atmospheric oxygen due to the photosynthetic activity of cyanobacteria, which transformed Earth's anoxic atmosphere. This increase in oxygen led to drastic environmental changes and affected different organisms in various ways.
Answering the question, what did not occur in the Proterozoic eon, option D (anaerobic bacteria kept thriving with more oxygen) is incorrect. As the oxygen levels increased, many anaerobic bacteria were decimated because they could not survive in the presence of free oxygen. On the other hand, aerobic organisms thrived and evolved under these new oxygen-rich conditions.
What is the primary function of plant leaves?
Answer: The primary function of leaves is to collect sunlight, for use in photosynthesis.
Hope this helped!!
Answer:
The primary function of leaves is to collect sunlight as the energy source to drive photosynthesis.
Explanation:
Photosynthesis is the process that occurs in plant cells. The chlorophyll (green pigmint) is what captures the sunlight energy.
. Unlike swamps and marshes, bogs get most of their water from
A. groundwater
B. precipitation
C. runoff.
D. floodwater.
Answer: B. Precipitation
Explanation:
Answer:
B. precipitation
Explanation:
Bogs refer to the wet and muddy ground that mostly consist of dead plants and mosses undergoing the process of decomposition. Bogs receives its water from precipitation. Various sources of precipitation are rain, snow, hail, sleet etc. So, unlike swamps and marshes, all these forms of precipitation impart water to bogs.
17. The enzyme DNA polymerase works only in the 5' to 3' direction. How does this affect the leading strand and the lagging strand?
O A. DNA polymerase can use only the leading strand as a template. A different enzyme is used to synthesize DNA on the lagging strand
O B. DNA polymerase can work on both the leading and the lagging strand but is much faster on the leading strand
O C. DNA polymerase can work continuously on the leading strand but must flip the lagging strand around before it can work on it
O D. DNA polymerase can work continuously on the leading strand but works discontinuously on the lagging strand, creating Okazaki fragments.
Answer:
D
Explanation:
This is because the two DNA strands run antiparallel to each other. This means that as the DNA polymerase replicates the leading strand from 5’ --> 3’, the lagging strand is oriented in the 3’ --> 5’ which makes it difficult for a continuous replication like that of the leading strand. The DNA polymerase has evolved a mechanism to replicate the lagging strand discontinuously using many primers. This generates many fragments called Okazaki fragments that are ligated together to form one complete strand.
Answer:
d
Explanation:
identify two possible options you studied for dealing with spent nuclear fuel rods
Answer: A. burying them in deep caverns. AND D. removing lighter nuclei and reusing them
Answer:
A & D
Explanation:
Burying them in deep caverns & removing lighter nuclei and reusing them are the correct a p e .x answers
Read the excerpt from The code book. What part of speech is the underlined word?
Answer:
Adjective
Explanation:
When we say encryption product, the word encryption modifies the noun product. So in this case, encryption is an adjective. It's like when we say apple pie. Apple modifies the noun pie, so in this case, the word apple is an adjective. Another example would be facial expression. Facial in this case modifies the noun, expression.
Answer:
adjective
Explanation:
just did the quiz
why would imbalance hormone levels cause a male to be unable to reproduce
Answer:
Many Reasons
Explanation:
For starters, low T - or low Testosterone can lead to low libido, which may physically cause him not to want to reproduce. Low T can also have detrimental effects to the fidelity or health of sperm cells, as testosterone is necessary for the proper maturation of sperm. That means then, that at the cellular level if you have unhealthy sperm then they may not be able to fertilize an egg.
What term do scientists use to describe all the different forms of life on Earth? landscape biodiversity environment ecosystem
Answer:
The term that scientists use to describe the different forms of life on earth is biodiversity.
Explanation:
Biodiversity means biological diversity, a term that refers to the large number of species -among animals and plants- that exist on the planet. This diversity or variety is due, in principle, to the different genetic expressions that have resulted from evolutionary changes over time.
Biological diversity is a factor that defines the different ways in which an ecosystem can be presented and the interactions that can occur between living organisms.
The term Biodiversity is a compound word that comes from the words biology and diversity, first used in 1986 and recognized by the International Convention on Biological Diversity.
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Answer: Ecosystem or Biotop.
Explanation:
It represents a space that is inhabited by living organisms and their communities. As a rule, every living community occupies a particular living space and consumes it, which means finding food, breathing and using the area as protection. The scope mentioned is called a biotop. Different ecosystems in one climate zone create larger entities - biomes.
What factors in earths relationship to the sun make life on earth possible
The distance from the Sun allows for the right amount of light absorption, allows the right intensity of heat, and the gravitational pull of the sun on the earth keeps it from going out into outer space.
Hope this helped :)
Answer:
The earth is just the right distance from the sun to allow life not to freeze or burn to death.
What are the most important animals to the Great Barrier Reef?
sting Ray
plankton
whales
Final answer:
The Great Barrier Reef is a vital marine ecosystem housing critical species such as corals, fish, turtles, and sharks, each playing a unique role in maintaining the reef's health and balance.
Explanation:
The Great Barrier Reef is an extensive and vibrant marine ecosystem off the coast of Australia, known for its richness in biodiversity and its significance to the marine life that calls it home. Among the myriad of creatures, several key species play critical roles in maintaining the health and balance of the reef system.
Coral: Foundation species of the reef, corals are not just structures but living organisms. They are vital for creating the environment in which many reef species thrive. Coral bleaching, a process caused by rising water temperatures, poses a significant threat to these foundational species and, by extension, the entire reef ecosystem.Fish: Fish species contribute to the reef in various ways, including maintaining algae levels, contributing to the coral polyp's diet, and helping to control populations of other marine creatures, ensuring ecological balance.Turtles: These marine reptiles are crucial for nutrient cycling within the reef. By feeding on seagrasses and jellyfish, they help to maintain healthy seagrass beds and control jellyfish populations.Sharks: Acting as apex predators, sharks are essential for maintaining the health of the reef by controlling the population of other marine creatures and removing the weak and sick.Each of these species, along with countless others, contributes to the delicate balance of the Great Barrier Reef, making them crucial for its survival and the maintenance of its biodiversity.
the characteristics listed above describe the domain
Answer:
B) Bacteria
Explanation:
Different domains can have rRNA sequences which can be the basis of the difference. A prokaryotic that contains unique rRNA and can survive in extreme environments. Its cell walls do not contain peptidoglycan membranes and is made of branched hydrocarbon chains, all these characteristics describe Archaea, i.e., option A.
What are archaea?Archaea could live in extreme environments, such as hydrothermal vents and terrestrial hot springs.
They were also found in a wide range of highly saline, acidic, and anaerobic environments. Due to this, these were defined as the limit of life on Earth.
They can have characteristics like prokaryotic that contains unique rRNA and can survive in extreme environments.
Its cell walls do not contain peptidoglycan membranes and is made of branched hydrocarbon chains.
Thus, the correct option is A.
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As one would expect, throughout the world there is a strong relationship between the quantity of energy a country uses and the size of its
Answer:
economy
Explanation:
Whichever country do we look at, there is a strong relationship between the quantity of energy that the country uses and the size of its economy. The more developed and the larger the economy of a country is, the more energy is demanded for the economy to be driven. This leads to high demand for certain natural resources that produce energy, as the industry needs power in order to function. We can easily see this if we take in consideration the biggest economies in the world, USA, China, Japan, Germany, UK, France, and then if we see how much energy each of them uses, so we will come to a conclusion that the biggest economies are the biggest users of energy.
the splitting of an atom is called_______?plz answer asap
the splitting of an atom is called "nuclear fission".
Answer:
nuclear fission
Explanation:
What was the history of life on earth recorded in?
Answer: living and fossil organisms evolved
Explanation:
Invasive species can enter a habit in many ways. How were these invasive species introduced?
A species of rats entered a habitat stowed away in a train -> unintentioal introduction
A man added invasive water hyacinths to beautify his private lake -> intentional introduction
A flood prompted many aquatic species to inhabit a new area -> loss of habitat
Select all of the answers that apply:
1. Severe weather that has caused deaths includes _____.
light
rain
thunderstorms
hurricanes
tornadoes
floods
droughts
clear skies
Droughts , floods, tornadoes, hurricanes
Thunderstorms, Hurricanes, Tornadoes, Floods and droughts
What are the Archeabacteria's Characteristics
Answer:
Most protists are unicellular. You may be wondering why those protists are not classified in the Archaebacteria or Eubacteria kingdoms. It is because, unlike bacteria, protists are complex cells.
Also:
Among these three main types of archaea are some subtypes, which include: Methanogens — archaeans that produce methane gas as a waste product of their "digestion," or process of making energy. Halophiles — those archaeans that live in salty environments.
Didn't Cheat!
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Answer:
Archaebacteria are the prokaryotic anaerobic bacteria.
Explanation:
Archaebacteria are the prokaryotic bacteria. They live in an extremely harsh environment. They are different from the other bacteria with some characters like their habitat. Their cell wall don't have peptidoglycan like other bacteria. Archaebacteria are resistance to penicillin and some other antibiotics. These are of three groups such as methanogens, Halophiles, and thermoacidophiles.
Methanogens are methane-producing bacteria and used as fuel. Halophiles are found in saline water and heavy salt concentration. They contain red carotenoid pigment in the cell. So they appear red. Thermoacidophiles can live in extremely high temperatures and high acidity.
Which statement accurately describes the movement of Earth's plates due to convection currents?
Material near the core cools as heat is transferred toward the crust.
Heated materials become denser, causing them to rise toward the surface.
As heated material gets closer to the surface, it begins to cool,
As materials cool, they become less dense and sink back toward the core.
Answer:
As heated material gets closer to the surface, it begins to cool
Explanation:
The core and surface have very different temperatures where the core is extremely hot as compared to the surface. When mantle gets heated as it passes near the core, it rises towards the surface. When it reaches the surface, it begins to cool and becomes more dense. The cooled magma then starts to sink down back near the core where it gets heated again and rises. This is what drives convection currents.
The Earth's plates move as a result of convection currents, with hot material rising towards the crust, cooling, becoming denser, and sinking back towards the core; a continuous cycle that drives plate tectonics.
Explanation:The movement of Earth's plates is largely driven by convection currents within the Earth's mantle. Material near the core becomes heated and becomes less dense, causing it to rise towards the crust. This is reflected in the statement 'Heated materials become less dense, causing them to rise toward the surface'. Once this heated material gets closer to the surface, it begins to cool and becomes denser. This is referred to in the statement 'As heated material gets closer to the surface, it begins to cool'.
As it cools, the material becomes denser and sinks back towards the core, as referenced in the statement 'As materials cool, they become less dense and sink back toward the core'. This continuous cycle of heating, rising, cooling, and sinking causes the movement of Earth's plates.
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Which type of soil is most likely to be found in horizon E?
A. A layer of bedrock
B. A layer of decayed plant matter
C. A layer of parent material
D. A layer of pale, Sandy soil lacking clay and iron
Answer:
D. A layer of pale, sandy soil lacking clay and iron
Explanation:
The soil is complex, composed of multiple layers/horizons all of which have different characteristic that make every horizon to have its own special role in it. The horizon E is the third horizon from the top. This horizon is characterized by being mostly sandy, and because the water manages to go through it very easily it is a horizon in which there's heavy leaching going on. Because of the leaching, this horizon loses the clay, iron, and aluminium from it, thus they accumulate in the horizon below it. As a horizon it is very important, especially for the trees, as their root systems manage to develop very well in this horizon because it is loos and sandy.
Answer:
D. A layer of pale, sandy soil lacking clay and iron
Explanation:
Which of the following is an example of maintaining homeostasis?
A. Drinking water
B. Learning math
C. Playing board games
D. Calling friends
Answer:
I think its A. Drinking water.
Drinking water is example of maintaining homeostasis.
Explanation:
Homeostasis is the ability of a system to remain in equilibrium in terms of temperature or to maintain other physiological features. Since the sweating is responsible for cooling down the elevated body temperature hence drinking water can help in maintaining homeostasis. Homeostasis is a state where the proper functioning of body can take place. If the body is out of homeostasis or equilibrium then the function of the body will not be able to execute properly.
what structure attaches muscle to bone
Answer:
tendons
Explanation:
A tendon attaches muscle to bone, transmitting the force from the muscle contraction to allow body movement.
Explanation:The structure that attaches muscle to bone is called a tendon. Tendons are made of tough connective tissue and serve to transmit the force generated when a muscle contracts, allowing the movement of the skeleton. For a skeletal muscle to pull on a bone and create movement at a joint, it has specific attachment points; the origin is where the muscle attaches to the fixed (stabilized) bone, and the insertion is where the muscle connects to the bone that gets moved.
Wladimir Köppen’s climate system was developed _____.
before 1850
around 1900
about 1950
after 1990
Answer: before 1850
Explanation:
Station 3! HELP PLS!
1. Animals with backbones belong to the ____ phylum.
A. Cordate
B. Echinoderm
C. Athropod
D. Mollusk
2. Jellyfish and coral belong to the same phylum as ____.
A. Snails
B. Sponges
C. Sea Anemones
D. Fish
3. An animal belonging to the phylum athropoda is a ____.
A. Tapeworm
B. Lobster
C. Squid
D. Slug
4. ____ is the class of athropods which have 8 legs.
A. Arachnid
B. Insect
C. Centipede
D. Cephalopod
Answer:
Arachnid (4)
Explanation:
Note: I am not into this type of science at all, but I try.
I can answer number 4 for you: Arachnid. Arachinds involve animals like spiders, which have 8 legs.
Again, I haven't really gotten into this science yet, it POSSIBLY may be wrong.