What type of relationship is it?

Question

A squid emits light that can hide it from predators. The light is actually produced by bacteria living in part of the squid’s body called a light organ. The squid provides nourishment for the bacteria throughout its life.

What type of relationship is it?

a	Parasitism
b	Mutualism
c	Commensalism
d	Competition

Answer 1

This is Mutualism! Both organisms involved in the relationship receive a benefit of some kind. The bacteria receive food, and the squid receives defense from predators. the relationship is mutually beneficial, hence the term "mutualism".