Most coral reefs are located in shallow water because below this depth,_____.
A)there is not enough oxygen
B)water temperatures are too cold for coral to grow
C)water currents are too fast for coral to colonize
D)sunlight levels are too low to sustain the photosynthetic algae living within the coral exoskeleton

Question

Quizplus · Accepted Answer

Coral reefs require sunlight for the photosynthetic algae, called zooxanthellae, living within their exoskeleton to produce energy through photosynthesis. Below a certain depth, there is not enough sunlight for these algae to survive and coral growth is inhibited.

Most Coral Reefs Are Located in Shallow Water Because Below