Which Statement Describes an Important Difference Between a Keystone Species

Which statement describes an important difference between a keystone species and a foundation species?

A) Keystone species tend to be larger and more abundant than foundation species.
B) Foundation species tend to be larger and more abundant than keystone species.
C) Keystone species have large effects on communities; foundation species have smaller effects.
D) Keystone species have small effects on communities; foundation species have larger effects.
E) Keystone species have strong interactions with other community members; foundation species do not.

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