When Snapping Shrimp Are Building Their Homes in the Seafloor

Multiple Choice

When snapping shrimp are building their homes in the seafloor, goby fish keep guard and flap their tails when danger is approaching. As part of this relationship, the shrimp allow the gobies to sleep in the burrow and use it for cover from predators. This is an example of

A) symbiosis.
B) biofilms.
C) bioremediation.
D) endosymbiosis.