Question

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 1

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.

Step-by-step explanation: