Question

A keystone species is a species that has an unusually __________ effect on its ecosystem.

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large
small

Answer 1

large

Step-by-step explanation:

it's a keystone species because it's unusually important in its ecosystem, it plays a big part.

the word keystone is used because it has to do with something being dependent on it

Answer 2

A keystone species is a species that has an unusually large effect on its ecosystem.

Step-by-step explanation:

hope this help