Why are pioneer species usually autotrophs?

A.Newly established ecosystems do not usually have pre-existing food sources.

B.Only autotrophs are large enough to survive.

C.Autotrophs are usually at the top of an ecosystem's food chain.

D.Only autotrophs can survive where water is scarce.

Answer: Newly established ecosystems do not usually have per-existing food sources. ... An exotic insect is introduced to a forest ecosystem. It is resistant to the toxins the trees produce to protect them from being eaten by insects.

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Why are pioneer species usually autotrophs?A.Newly established ecosystems do not usually have pre-existing food sources.B.Only autotrophs are large enough to survive.C.Autotrophs are usually at the top of an ecosystem's food chain.D.Only autotrophs can survive where water is scarce.

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Why are pioneer species usually autotrophs?

A.Newly established ecosystems do not usually have pre-existing food sources.

B.Only autotrophs are large enough to survive.

C.Autotrophs are usually at the top of an ecosystem's food chain.

D.Only autotrophs can survive where water is scarce.