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(08.02 mc)researchers determine an organism from africa has a normal distribution for body size. the organism is introduced and released into the united states as an exotic species. after 20 years, scientists have recorded how the organism has fit into the u.s. ecosystem. data show that predators have selected against the exotic species with the larger body size. predict the most likely type of natural selection that occurred on the exotic species over the 20-year period.

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smilodon
The type of natural selection that occurred during the period of 20 years is the: directional natural selection.

This type of natural selection favors the extremes of the normal distribution, causing the mean of the distribution to shift to the one extreme.

In this case, the smaller body size was favored and lead to an overall decrease in body size over the course of 20 years.

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