___________ structures are similar because they evolved from common ancestors

________ structures are similar because the organism needed to fill similar needs in their envornments.

A _______ is a structure that no longer serves its original purpose.

Which of these is a vestigial structure?

Who developed the theory of natural selection?

__________ is gradual change in an species over time.

Process by which organisms that are better adapted to their environment survive and produce more offspring.

________ is a measure of an organism's ability to survive and reproduce in its environment.

a trait that helps an organism survive and reproduce

_________ selection occurs when human choose which organisms reproduce in order to obtain certain desirable traits.

The similar bone structure in the forelimbs of humans, bat, and whales is an example of _______

The development of fins in penguin, fish, and whales is an example of ________

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