AP BIOLOGY

Detailed explanation-1: -Evolution is a gradual process in which something changes into a different and usually more complex or better form. The mechanisms of evolution include natural selection acting on the genetic variation among individuals, mutation, migration and genetic drift.

Detailed explanation-2: -Evolution is a gradual and continuing process of change that occurs over a period of time, due to slight variations in genetic compositions as well as changes in environment, leading to formation of new species.

Detailed explanation-3: -Evolution is a process of gradual development in a particular situation or thing over a period of time. [formal]

Detailed explanation-4: -Gradualism, from the Latin gradus ("step"), is a hypothesis, a theory or a tenet assuming that change comes about gradually or that variation is gradual in nature and happens over time as opposed to in large steps. Uniformitarianism, incrementalism, and reformism are similar concepts.

Detailed explanation-5: -Evolution is the slow, gradual process through which present day complex forms of life have descended from simple organisms of the past.