How Do Ecological Communities Change Over Time

How do ecological communities change over time?

A) Interactions between and among species may cause changes in ecological communities over time.
B) Keystone species typically become the most common species within an ecological community.
C) Species richness typically declines as one species outcompetes all other species.
D) Ecological communities are defined at a given point in time; any change leads to reclassification of the community.

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