Question

​An intertidal species of sea star helps to maintain the diversity of the intertidal region by controlling the mussel population. Without the sea star, the mussel population would crowd out other species and take over their territory. The sea star could be called a(n) ____.

a. ​indicator species

b. ​keystone species

c. ​foundation species

d. ​aggressive species

e. ​repressor species

Answer

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