Salmon getting smaller in a matter of years is an example of:
geoinstability
microevolution
extinction
macroevolution​

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Explanation:

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Salmon populations can become smaller bodied, on average, in two non-mutually exclusive ways. First, they may be growing smaller if they cannot acquire enough food at sea. This results in salmon of the same age that are smaller than they were in the past. Second, salmon may return from the ocean at younger ages.

Explanation:

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