The "dead zone" in the Gulf of Mexico is:_______.
A. home to numerous bacteria and bottom dwellers, such as sea stars and spiny lobsters, but no fishes.
B. due to regular dumping of untreated human sewage into the gulf.
C. a large zone of hypoxia caused by excessive decomposition of algae.
D. present year round.
E. the largest oxygen-free zone identified to date.