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...
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