Charles Darwin puzzled over differences in the _____ of the different species of Galapagos finches.

Darwin observed variations among individuals within a population, but he did not realize that these variations were caused by

Which of the following factors is necessary for natural selection to occur in a species?

Which of the following is an example of natural selection?

Which was NOT a source of Charles Darwin’s ideas about evolution?

Populations of all species are limited by

Modern scientific explanations of evolution

What is the process by which organisms that are better adapted to their environment survive and reproduce more successfully than less well adapted organisms do?

What evidence of natural selection is available today that was not available to Darwin?

A spider may produce hundreds of eggs, only a few of which may survive. This is an example of

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