Keystone species
a) occur only in intertidal zones
b) can be removed from a habitat without any impact on the remaining species in the habitat
c) play an unusually important role in determining the species composition in a habitat
d) are primary produces, and therefore, are usually plants
e) are more expendable than commensal species, from a conservation perspective
Answer: c) play an unusually important role in determining the species composition in a habitat
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