If You Own a Dog, Each Year, Depending on the Region

Multiple Choice

If you own a dog, each year, depending on the region where you live, you will need to buy medication that treats roundworms and ticks and fleas. These organisms live either internally or externally on dogs and obtain all their nutrients from the dog. In some cases, dogs are harmed due to these interactions. This describes a __________ relationship.

A) commensal
B) mutualistic
C) parasitic
D) tertiary