Variation: the difference in appearance of an inherited trait in the members of a species.
Adaptation: a variation that increases an organism's chances for survival.
Natural selection: a theory that says organism's best adapted to their environment live longest and pass their traits to their offspring.
Competition: the struggle among living things to obtain the resources they need to survive.
Mutation: a change in a gene.
Isolation: the separation of one group from others of the same species
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