In what way are autotrophic protists essential to the survival of aquatic ecosystems? A. They remove toxins from the water.

B. They produce extensive reefs.

C. They serve as the base of the food chains.

D. They convert nitrogen gas into ammonia.

I think is C

Explanation:

bc blah

explanation:

bc blah

some fungi obtain their nutrients from a living host (plant or animal) and are called most biotrophic fungi have fairly narrow host ranges—they are specialized on a limited called rhizomorphs that allow the fungus to grow from one tree to another. ascospores are formed inside a sac-like structure called an ascus. so your answer is a