Coral Bleaching Occurs ____

Multiple Choice

Coral bleaching occurs ____.

A) when excessive runoff allows household bleach to enter coral reefs
B) when reefs become pale because algae leave and polyps die
C) when the water becomes too alkaline and polyps overgrow
D) when the calcium carbonate skeleton of a reef becomes overgrown
E) When there is an overgrowth of phytoplankton within the coral reef