Organisms That Take CO2 Out of the Water and Sequester

Multiple Choice

Organisms that take CO2 out of the water and sequester it in the form of calcium carbonate are

A) increasing in numbers because of the excess carbon dioxide in the atmosphere.
B) effectively serving as a sink for carbon dioxide.
C) being threatened by the increasing acidity of the oceans from carbonic acid.
D) disappearing at an alarming rate as oceans become more alkaline.
E) converting the calcium carbonate to sulfuric acid.