1) Sea otters ....... on sea urchins. a) prey b) preys c) is preys d) is prey 2) Sea urchins ....... on kelp. a) feeds b) feed 3) This loss of kelp will .......numerous species that rely on it for food and shelte a) affects b) affect 4) By keeping sea urchins in check sea otters indirectly .................... the entire ecosystem from the kelp itself to fish and other marine life that depend on. a) support b) supports c) are d) do 5) That’s why they ...............considered keystone species. a) are b) do 6) Removing them will ...................a dramatic shift in the ecosystem potentially leading to its collapse. a) cause b) causes 7) This concept ................... to many other ecosystems when a single species can have an outsized effect on its environment. a) applies b) apply c) is applies 8) A single species ............. an outsized effect on its environment. a) can have b) can has c) cans have d) cans has

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