A change in a kind of organism over time

A well-tested explanation that unifies a broad range of observations

Selection by humans for breeding of useful traits from the natural variation among different organisms

The ability of an organism to survive and reproduce in its environment

The inherited characteristic that increases an organism's chance of survival

The structures that have different mature forms in different organisms but develop from the same embryonic tissues

An organ that serves no useful function in an organism; remain of ancestor.

The process by which unrelated organisms independently evolve similarities when adapting to similar environments

The preserved remains or evidence of an ancient organism

process by which individuals that are better suited to their environment survive and reproduce most successfully.

Species splits into two or more descendant species, resulting in once similar or related species to become more and more dissimilar.

The process by which two species evolve in response to changes in each other.

A trait or an organ that appears similar in two unrelated organisms.

The differences among individuals of a species.

The principle that all living things have a common ancestor.

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