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Evidence used to prove that the ancient ancestor of whales was a land-dwelling mammal


Groups of individuals of the same species living in the same place


Naturalist who proposed that evolution happens through natural selection

Fossil record

Timeline of life provided by the remains or imprints of dead organisms


A group of organism that can mate with one another to produce fertile offspring


Process of separation, adaptation, and division

Natural selection

Process consisting of overproduction, inherited variation, the struggle to survive, and successful reproduction

Hip bones

Whales possibly inherited this from a four-legged ancestor

Starvation, disease, competition, and predation

Populations of species are limited by these


Trace remains of an organism that lived long ago, most commonly preserved in sedimentary rock


A spider producing hundreds of of eggs, in which only a few survive

DNA and genetic changes

Darwin did not include these in his ideas about evolution


Scientists compare DNA to support the theory that all species share a common...

Selective breeding

Could be used by farmers to produce vegetables that will grow in a specific climate


Characteristic that can be passed from parent to offspring through genes


Process by which populations slowly change over time


Over time, animals may change behavior or physical appearance in response to changes in the environment

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