When both organisms live together and both benefit,this is symbiosis.When both organisms live together and neither benefits,this is commensalism.When both organisms live together and one organism benefits at the expense of the host,this is parasitism.Mutualism and symbiosis are synonyms.

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Parasitism Is

Question 19

Multiple Choice

Parasitism is:

A) A biologic relationship between two or more organisms in which both benefit from one another
B) A biologic relationship between only two organisms in which there are no beneficial or harmful effects to the host
C) A biologic relationship in which one species gains benefits at the expense of the host
D) A synonym for mutualism

Correct Answer: