AP BIOLOGY

Detailed explanation-1: -So, the correct answer is ‘Mutation’

Detailed explanation-2: -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.

Detailed explanation-3: -The essence of Darwin’s theory is that natural selection will occur if three conditions are met. These conditions, highlighted in bold above, are a struggle for existence, variation and inheritance.

Detailed explanation-4: -Critics of evolution assert that evolution is “just a theory", which emphasizes that scientific theories are never absolute, or misleadingly presents it as a matter of opinion rather than of fact or evidence.