What type of relationship is this?

Question

After people eat coconuts, the coconut shells are discarded. Some of these discarded shells in Indonesia are picked up by a species of octopus. The octopi use the shells for shelter and protection.

What type of relationship is this?

a	Parasitism
b	Mutualism
c	Competition
d	Commensalism

Answer 1

I will provide the definitions for each below, if you continue to have difficulty determining the answer, let me know.

Parasitism is a form of symbiosis in which one organism (called parasite) benefits at the expense of another organism usually of different species (called host)

Mutualisms are defined as interactions between organisms of two different species, in which each organism benefits from the interaction in some way

Competition is when two organisms compete for resources.

Commensalism, in biology, a relationship between individuals of two species in which one species obtains food or other benefits from the other without either harming or benefiting the latter