Given the stream of consciousness rationale, provide a reasonable question and answer. Rationale: Coral reefs provide food and shelter to many ocean organisms. Coral reefs are predominantly calcite. Calcite provides food and shelter to many ocean organisms.
 The question and answer:
What provides food and shelter to many ocean organisms?
Options:
- (A) houses
- (B) umbrellas
- (C) limestone
- (D) ferns
- (E) sharks
- (F) barnacles
- (G) calcite
- (H) sheds
The answer is (G)