Grutter Tested the Effect of Cleaner Fish on Species Diversity

Multiple Choice

Grutter tested the effect of cleaner fish on species diversity in the Great Barrier Reef by

A) adding cleaner fish to reefs that did not have them.
B) experimentally removing cleaner fish from certain reefs.
C) manipulating fish so they would not associate with cleaner fish.
D) manipulating fish so they would eat cleaner fish.