what is the main idea of Darwin's theory of evolution by natural selection?
Darwin's theory of evolution by natural selection suggests that inherited characteristics vary among offspring and those allowing the best competition for resources lead to survival, reproduction, and passing of those traits onto the next generation. Over time, this results in population evolution and increased adaptation to the environment, a process known as 'descent with modification'.
Explanation:The main idea of Darwin's theory of evolution by natural selection involves three principles. First, most characteristics of organisms are inherited from parents to offspring. Second, more offspring are produced than can survive due to limited resources, leading to competition. Third, offspring differ from each other in their inherited characteristics.
Darwin reasoned that offspring inheriting characteristics allowing them to best compete for limited resources will survive, reproducing more than less competitive individuals. Over time, due to these inherited traits being passed onto successive generations with increasing frequency, populations evolve in a process Darwin termed 'descent with modification'. So, the population becomes more adapted to its environment.
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Which type of protein, embedded in the plasma membrane, aids reactions of molecules that arrive?
channel
carrier
enzymes
peripheral
which organisms can cause contagious diseases
Answer: It is microorganisms I just took the test.
Explanation:
describe the milankovitch cycle.
The Milankovitch Cycle refers to cyclic changes in Earth's orbit, including eccentricity, obliquity, and precession, which influence the climate by altering the amount and distribution of solar radiation received by Earth.
Explanation:The Milankovitch Cycle, as established by Serbian astronomer Milutin Milankovich, is a theory that describes the cyclic changes in Earth's orbit and its impact on climate. This cycle involves three main components: eccentricity, obliquity, and precession.
Eccentricity refers to the variation of Earth's orbit from more circular to more elliptical, following a cycle of about 100,000 years. This change influences the proximity of the Earth to the Sun, thereby altering the amount of solar radiation the Earth receives.
The next component, obliquity, refers to the changes in the inclination of the Earth's axis. This change can result in varying degrees of solar radiation being received by different areas of the Earth, contributing to climate changes.
Finally, precession is the Earth's slow wobble as it spins on the axis which may result in more extreme climates and ice ages. This effect can sway the balance of climate, instigating dramatic shifts such as the ice ages.
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Which of the following is a true statement about remote sensing?
Humans and other heterotrophs get their energy from eating food. What process in human body cells transfers the energy stored in a grilled cheese sandwich to ATP? What chemical equation summarizes this process?
what is the function of DNA, and how does the structure of DNA influence its function
DNA serves functions in inheritance and protein synthesis. Its structure, a double helix, determines its function through the arrangement of nucleotides.
Explanation:DNA serves two essential functions: inheritance and protein synthesis. DNA is responsible for passing genetic information from parent to offspring, and it is replicated with high accuracy to maintain the integrity of this information. DNA also directs the construction of proteins necessary for cell growth and reproduction.
The structure of DNA influences its function through the arrangement of nucleotides. DNA is composed of two strands that form a double helix. The sequence of nucleotides along the strands encodes the genetic information. The specific base pairing between nucleotides ensures accurate replication and protein synthesis.
Students planted three bean seeds after several days, they observed that the seeds' roots were growing downward into the soil which type of tropism were the roots displaying
A. Geotropism
B. Thigmotropism
C. Phototropism
D. Photoperiodism
Which level of organization is made of different types of tissue working together to perform a specific job for your body
how would a Bohr model of a neon atom differ from this model of nitrogen
A Bohr model of a neon atom differs from the model of a nitrogen atom in terms of the number of electrons, electron configuration, and energy levels.
Explanation:A Bohr model of a neon atom differs from the model of a nitrogen atom in several ways:
The number of electrons: Neon has 10 electrons, while nitrogen has 7 electrons.The electron configuration: Neon has the electron configuration of [He]2s22p6, while nitrogen has the electron configuration of [He]2s22p3.The energy levels: Neon has more energy levels compared to nitrogen because it has more electrons. This means that there are more possible orbits for electrons to occupy in a neon atom.Learn more about Bohr model of atoms here:https://brainly.com/question/11872378
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What is true about the structure or function of the plasma membrane
A. Large molecules often cross the plasma membrane while inside vesicles
B. Hydrophobic molecules keep the cell from getting too much water
C. The bilayer structure forms a solid boundary that separates the cell from it's enviroment.
D. It is made entirely of intergal proteins
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The right answer is A.
This phenomenon is called endocytosis.
Endocytosis is the mechanism of transport of molecules or even particles (viral, bacterial, etc.) to the inside of the cell.
Endocytosis can be performed by all eukaryotic cells except red blood cells.
This membrane mechanism (or quasi-membrane) is very important in the life of a cell, because it allows the internalization of specific molecules through specific receptors in the cell (and in particular in the cytosol), the molecule to "endocyte" being called ligand (eg, the transferrin (ligand) that will bind to specific membrane receptors of transferrin).
The plasma membrane is composed of a bilayer of phospholipid molecules that acts as a barrier between the cell and its environment. Hydrophobic molecules keep the cell from getting too much water. The plasma membrane is not made entirely of integral proteins.
Explanation:The plasma membrane is composed mainly of a bilayer of phospholipid molecules that forms a barrier between the cytoplasm inside the cell and the environment outside the cell. It allows only certain substances to pass in or out of the cell. Some cells have extensions of their plasma membrane with other functions, such as flagella or cilia.
Hydrophobic molecules are important in keeping the cell from getting too much water. Since the interior of the plasma membrane is hydrophobic, it prevents water from freely crossing the membrane.
The plasma membrane is not made entirely of integral proteins. It is primarily composed of phospholipids arranged in a bilayer, with integral proteins embedded within the membrane and peripheral proteins associated with the membrane surface.
Which kind of organism is a heterotroph?
Answer:
Heterotrophs are defined as those organisms that cannot prepare their own food. It is because they cannot carry out the process of photosynthesis. They are depended either directly or indirectly on the producers (autotrophs) as they obtain their food and energy from the autotrophs, in order to survive.
In term of the food chain, the heterotrophs are usually considered as the secondary as well as the tertiary consumers. The heterotrophs include the Herbivores (such as sheep, horse), carnivores (such as lion and tiger) and the omnivores (humans and microbes).
When a star's nuclear energy runs out, it dies. A star can die in many ways. A _____ is one way a star might die, and it can trigger the beginning of a new star's life cycle.
What keeps cells from growing to much larger sizes than they do
all organism have a genetic code carried in molecule called
Which location would be relatively warmer during winters, and why?
An inland location, because land cools down slower than water
A coastal location, because water cools down slower than land
An inland location, because land has higher specific heat than water
A coastal location, because land has higher specific heat than water
Answer:
A coastal location, because water cools down slower than land
Explanation:
The water and the earth have specific heat different from each other.
The water heats up more slowly than the earth, but it also cools more slowly than the earth. For this reason, when we go to the beach we realize that the sand is hot, while the water is cold it causes the air currents to blow from the sea to the beach, because the air above the sand is hotter than the air it is. above the water, and the hot air goes on and the cold goes down. During the night, this is reversed, as the water is still hot, and it gets hotter than the sand, which cools faster, reversing the breezes.
In summary, because the water's cooling speed is slower than that of the land, we can say that a coastal location would be a relatively hot spot during the winter, because the land has a higher specific heat than water
Which statement describes a compound machine?
A.
It has movement in only one direction.
B.
It can only be acted on by one force.
C.
It is made up of more than one simple machine.
D.
It makes work more difficult.
Answer: C
Explanation: I took the test, it was correct!
Why would a diverse community be more resistant to disease, predation, and invasion
in your own words explain John Locke's theory of natural law
Final answer:
John Locke's theory of natural law posits that individuals are born with inalienable rights, such as life, liberty, and property, grounded in a moral order rationality can determine. Contrary to Hobbes' view of an absolute sovereign, Locke believed in more egalitarian natural state conditions that lead to a social contract aimed at preserving these rights. Locke's philosophy significantly influenced democratic governance and individual liberties.
Explanation:
John Locke's Theory of Natural Law
John Locke, an influential English philosopher, articulated a distinct perspective on natural law and the state of nature. He posited that individuals are born with certain inalienable rights, including the rights to life, liberty, and property. Locke believed that these rights are grounded in natural law, which is the moral order discoverable by reason. He saw humans as generally peaceful in the state of nature, capable of realizing and upholding this moral order through rationality.
Locke's perspective diverges from that of Thomas Hobbes, who saw life in the state of nature as 'nasty, brutish, and short,' requiring an absolute sovereign to maintain order. In contrast, Locke envisioned a more cooperative state of nature where people live in a state of equality and with reciprocal power. When forming a government through a social contract, they do so with the intent of preserving these natural rights. Governments that fail to protect these rights are considered illegitimate, and the people have the right to revolt and establish a new, just government based on the principles of natural law.
Locke's ideas on natural rights and government by consent deeply influenced the formation of modern democratic states, including the early government of the United States, promoting the ideals of individual liberty and the rule of law.
What are the general mathematical operations you use when converting from SI unit to another
A machine will always increase the force required to complete a task.
true or false
what are two ways nitrogen can get into the ground?
What is algin? is it Diatomaceous earth used as an insulating material,
Brown algae,
A substance produced by brown algae used to thicken foods.
Diatom shells
Answer:
An algin is a substance produced by brown algae used to thicken foods.
Explanation:
Alginic acid is an organic chemical compound found in brown algae. Alginate forms highly viscous solutions in water. An alginate molecule is a copolymer made up of the two sugar units of guluronic acid and mannuronic acid. The ratio of the two sugars to the length of the molecule varies.
Alginate is used in the food industry as a solidifying agent and can in many cases replace gelatin. Therefore, since it is a plant product, it is used in a vegetarian diet.
A flood that covers the meadow and drowns animals and a late Frost that kills young plants are examples of how blank can affect the size of population
Does anyone know the answer to this ? What happens if you poke a hole in the plastic bottle of a balloon lung model?
PLEASE HELP ONLY 2 I CANT GET
1. The graph below shows the change in average beak size of a given bird population. Records indicate that a drought occurred in 1977. Which of the following is the most probable explanation for the observations?
1st Picture
A. A larger beak made it easier to compete for the limited food remaining. In response, the birds grew larger beaks.
B. The seeds available after the drought were large and tough. Working hard to crack those seeds helped the birds grow larger beaks over time.
C. There were only soft seeds available after the drought. More birds chose to develop larger beaks in order to collect and eat the seeds.
D. After the drought, only large seeds were available to eat. Birds with large beaks were better able to crack and eat these seeds.
2. The wing color of a certain species of moth is controlled by alleles at a single locus. Gray (G) is dominant to white (g). A scientist studied a large population of these moths, tracking the frequency of the G allele over time, as shown in the figure below.
2nd Picture
Assuming that the population was in Hardy-Weinberg equilibrium for this gene, what percentage of the moth population was homozygous recessive (gg) in 1975? (2 points)
A. 25%
B. 36%
C. 64%
D. 75%
From the graph, the possible explanation is that B. The seeds available after the drought were large and tough.
Graph.The information in the graph showed that the beak depth increased after the drought.
In this case, the seeds available after the drought were large and tough and working hard to crack those seeds helped the birds grow larger beaks over time.
Also, the percentage of the moth population was recessive (gg) in 1975 is 25%.
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The increase in bird beak size post-drought is most likely due to natural selection favoring the ability to eat larger seeds. The proportion of moths that are homozygous recessive in 1975 can't be determined without frequency information of the G allele.
Explanation:For the first question, the most probable explanation for the increase in beak size after the drought would be D. After the drought, only large seeds were available to eat. Birds with large beaks were better able to crack and eat these seeds. This scenario describes a classic example of natural selection, where a change in the environment creates a selective pressure that gives an advantage to individuals with certain traits, in this case, larger beaks.
As for the second question, if you're looking for the percentage of the moth population that was homozygous recessive (gg) in 1975, this under the Hardy-Weinberg principle can be calculated using the equation p²+2pq+q²=1, where q² represents the homozygous recessive. Without any given information on the frequency of the G allele, I am unable to accurately generate the percentage.
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Lillian wonders how fast a train can move around a particular curve before it falls off of the track. Which of the following is the best way for Lillian to figure this out?
A.Drive a train along a curve at different speeds until it falls off of the track.
B.Build a model train and track, and test one train going around one curve at different speeds.
C.Build a model train and track, and test one train going around several different curves at one speed.
D.Build a model train and track, and test different-sized trains going around one curve at the same speed.
Answer:
B.Build a model train and track, and test one train going around one curve at different speeds.
Explanation:
If Lillian wants to know how fast a train can move around a specific curve before it falls off the track, she must build a model of train and track and through that model she will test a train traveling through a curve at different speeds. That way she can analyze in detail the phenomenon she wants to observe and get answers.
She should never drive a train along a curve at different speeds until it falls off the track, because that would be very dangerous and irresponsible. For this reason, models are great for people to be able to analyze phenomena and situations that would not be right to analyze in real life.
Fungi exist primarily in the form of long filaments called _____.
A. mycelium
B. hyphae
C. septa
D. saprophytes
Answer:
fungi exist primarily in the form of long, tubular-like filaments called hyphae. a large amount of these hyphae all branched together make up a mycelia, or plurally mycelium.
The ___ is to sensory input as a major city is to a country's airplanes, through which all air traffic passes an route to the various destinations. Amygdala, cortex, thalamus, reticular formation
Which organelle prepares proteins into vesicles to transport from one area to another?
A. Golgi apparatus
B. chloroplasts
C. mitochondrion
D. rough endoplasmic reticulum