An inherited trait that increases an organism's chance of surviving and reproducing in a particular environment.

A fossil copy of an organism made when a mold of the organism is filled with sediment or mineral deposits

A record of all of the fossils ever discovered on Earth

The impression of an organism in a rock

The process by which organisms with variations that help them survive in their environment live longer, compete better, and reproduce more than those that do not have the variations

The preserved evidence of activity of an organism

The breeding of organisms for desired traits.

A slight difference in an inherited trait among individual members of a species

A strand of DNA or RNA surrounded by a layer of protein that can infect and replicate in a host cell

A mixture containing material from one or more deactivated pathogens, such as viruses

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