What Prevents Coral Reefs from Surviving Below the Euphotic Zone

Question

What prevents coral reefs from surviving below the euphotic zone?
A)high water density
B)high pressure
C)saline water
D)inadequate sunlight
E)damage from storms

Accepted Answer

Coral reefs require sunlight for photosynthesis by their symbiotic zooxanthellae. The euphotic zone is the upper part of the ocean where there is enough light for photosynthesis to occur. Below the euphotic zone, there is not enough sunlight for photosynthesis, which prohibits the survival of coral reefs. High water density, high pressure, saline water, and damage from storms are factors that can affect coral reefs, but they are not the primary reason for their inability to survive below the euphotic zone.