What Is Life? 2nd Edition by Jay Phelan

Exercise 9

Keystone species:
A) occur only in intertidal zones.
B) play an unusually important role in determining the species composition in a habitat.
C) can be removed from a habitat without any impact on the remaining species in the community.
D) are primary producers and therefore usually are plants.
E) are more expendable than commensal species, from a conservation perspective. Short-Answer Questions