Any change in the DNA of an organism

Gradual change of a species over time

The variety of organisms that inhabit the earth

Process in which animals that are better adapted survive

Gaps in the fossil record

Similar structures that related species have inherited from a common ancestor

Any difference between organisms of the same species

Process where scientists look at the half-life of chemicals contained in rocks to determine the age

Preserved remains or traces of an organisms that lived in the past

The disappearance of a species

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