AP BIOLOGY

Detailed explanation-1: -One of the major elements of natural selection is genetic variation, so one of the major elements which lead to natural selection within different species of within all species, which belongs to the same particular population. If the genetic variation, so genetic variation is the correct answer.

Detailed explanation-2: -Natural selection is a simple mechanism that causes populations of living things to change over time. In fact, it is so simple that it can be broken down into five basic steps, abbreviated here as VISTA: Variation, Inheritance, Selection, Time and Adaptation.

Detailed explanation-3: -Again, natural selection itself does not create new variation, it merely influences the proportion of existing variants. Most forms of selection reduce the amount of genetic variation within populations, which may be counteracted by the continual emergence of new variation via undirected mutation and recombination.

Detailed explanation-4: -Natural selection acts on existing heritable variation. For natural selection to act on a feature, there must already be variation, and that variation must be able to be passed on to offspring.

Detailed explanation-5: -There are four principles at work in evolution-variation, inheritance, selection and time. These are considered the components of the evolutionary mechanism of natural selection.