Author: Khan Academy via YouTube
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Adaptation by natural selection acting over generations is one important process by which species change over time in response to changes in environmental conditions. Traits that support successful survival and reproduction in the new environment become more common; those that do not become less common. Thus, the distribution of traits in a population changes.

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Credits:
"Medium ground finch Santa Cruz" by putneymark (CC BY-SA 2.0), via Flickr:

https://creativecommons.org/licenses/by-sa/2.0/

Data from Figure 5 in: Rosemary B. Grant and Peter R. Grant. What Darwin’s Finches Can Teach Us about the Evolutionary Origin and Regulation of Biodiversity. BioScience. 2003. 53: 965-975. http://bioscience.oxfordjournals.org/content/53/10/965.full.pdf+html

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