Coral reefs are among the world's richest ecosystems, second only to tropical rain forests. like the tropical rainforest, the coral reef ecosystem is in danger. coral is being harmed by all but one of the following.

D) Scientists are actually trying to build up certain minerals, like white carbonate, by using underwater electrical currents. Coral are very sensitive to changes in the environment, so any change in temperature, salinity, or sediments will harm the reefs. Blast fishing does not just kill fish; it destroys the entire area.

digestion

it excretes wastes