Question

read the passage. then answer the question.
a goby and an alpheid shrimp at the entrance of a burrow
alpheid shrimp are small crustaceans that build burrows, or underground shelters, in the sand. alpheid shrimp are blind and are vulnerable to predators when they are outside of their burrows.
a shrimp can share its burrow with a fish called a goby. the goby acts as a lookout for the blind shrimp. when the shrimp leaves the safety of the burrow, it touches its antennae to the gobys tail. if a predator comes near, the goby flicks its tail, alerting the shrimp to the danger. both animals then retreat to the safety of the burrow.
which type of relationship is formed when an alpheid shrimp shares its burrow with a goby?
commensal mutualistic parasitic

Explanation:

Mutualistic relationships are those where both species benefit. Here, the shrimp gets a lookout (goby alerts it to danger), and the goby gets a burrow (a place to live). In commensalism, only one benefits. In parasitism, one benefits at the expense of the other. Since both the shrimp and goby benefit, it's mutualistic.

Answer:

mutualistic