Heartworm Disease Is a Serious and Potentially Fatal Disease in Dogs

Multiple Choice

Heartworm disease is a serious and potentially fatal disease in dogs. It is caused by a worm called Dirofilaria immitis. As many as 30 species of mosquitoes can transmit heartworms. Adult heartworms live in the heart and pulmonary arteries of infected dogs. Adult worms cause disease by clogging the heart and major blood vessels leading from the heart and also interfere with the valve action in the heart. By clogging the main blood vessels, the blood supply to other organs of the body is reduced, particularly to the lungs, liver, and kidneys, leading to malfunction of these organs. This is an example of

A) ectoparasitism.
B) mutualism.
C) amensalism.
D) predation.
E) endoparasitism.