In a species of salamander, there are two forms, red and yellow. As the yellow form becomes less common due to predation and the red form more common, the yellow form becomes less likely to be eaten and more likely to survive and reproduce. The yellow form then becomes more common and roles of red and yellow forms reverse. This is an example of
A. negative frequency-dependent selection.
B. directional selection.
C. disruptive selection.
D. balancing selection.
A. negative frequency-dependent selection.
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what are some examples of environmental stress?
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