Question

Because they are so diverse, coral reefs are often called the rainforests of the sea. Which is not a biotic factor in the coral reef? A) algae B) coral C) rocks D) sponges

Answer 1

A) Algae.

(im not 100% sure but it makes the most sense to me. See if google knows to double check)

Answer 2

Answer:

the answer is C

Explanation:

Biotic factors are living things. Algae lives, coral lives and sponges live so that leaves rocks.