What are the requirements of natural selection?
- biodiversity 2. environmental stress or change.3. limited resources, 4. over abundance of populations
Natural selection can only choose among the variations already present in a population; it cannot create change. In order for natural selection to be effective, biodiversity must exist in the population.
Because there is virtually no genetic diversity, the cheetah population in east Africa is highly endangered. The cheetah is so adapted to its environment that any changes would probably lead to its extinction.
The "Darwin" finches exhibit the most changes during droughts that put the population under stress; these "sub species" split apart and interbreed to produce hybrids that are better suited to the typical environment after the drought ends. Natural selection is most effective in situations where there are environmental changes or stresses.
A portion of the cheetah problem stems from the fact that limited resources have selected only the fastest individuals, resulting in little genetic diversity. The fastest fox will find food while a slower individual might starve and not pass on its genes.
Natural selection drives the unfit to die and the well-adapted to pass on their genes because organisms have a tendency to overproduce offspring. If every mouse produced survived, there would soon be insufficient food to feed them all. As a result, some of the mice must die.
Natural selection must begin with a great deal of existing diversity and large populations. Environmental stress and limited resources will reduce the population and genetic diversity through natural selection. Natural selection does not create genes or biodiversity. On the contrary, it reduces genetic information and biodiversity.
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The requirements of natural selection include: variation in heritable traits, competition for limited resources, differential reproductive success based on traits, and the passing on of favorable traits to future generations.
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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
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