Question

which of the following is not one of the three major structures of coral reefs?
a. planulae
b. fringing
c. barrier
d. atoll

please select the best answer from the choices provided

○ a
○ b
○ c
○ d

Explanation:

Fringing, barrier, and atoll are the three major structural types of coral reefs. Planulae are the free-swimming larval form of corals, not a coral reef structure.

Answer:

A. planulae