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Evolution
Evolution is the sequence of changes in the characteristics of organisms over successive generations as a result of natural selection.
Trait
A characteristic that an organism can pass on to its offspring through its genes.
Variation
Any difference between individuals of the same species.
Adaptation
Inherited characteristic that increases an organism's chance of survival that can be structural, physiological or behavioral
Structural adaptation
A physical structure possessed by organism gives it an advantage to survive. For example, large teeth/claws on a lion, spines on a cactus
Physiological adaptation
A chemical advantage possessed by the organism that gives it an advantage. For example, penicillin and sickle cell anemia resistance.
Behavioral adaptation
A behavior exhibited by the organism gives it a competitive advantage. For example, migration of birds to warmer climate, hibernation of bears, storing of nuts by squirrels in the winter
Survival of the fittest
Process by which individuals that are better suited to their environment survive and reproduce most successfully; also called natural selection
Natural selection
A process in which individuals that have certain inherited traits tend to survive and reproduce at higher rates than other individuals because of those traits.