Question

1
ticks live on dogs and feed off the dogs blood. they may also infect the dog with a parasite that can cause the dog to become quite sick. dogs also are sometimes found to be very tired because a large volume of their blood has been drained.
a mutualism
b parasitism
c competition
d commensalism

Explanation:

• Mutualism: Both species benefit. But ticks harm dogs, so not mutualism.
• Parasitism: One organism (tick) benefits at the expense of another (dog). Ticks feed on dog's blood and make it sick, which fits parasitism.
• Competition: Organisms compete for resources. Not the case here.
• Commensalism: One benefits, the other is neither helped nor harmed. But dog is harmed, so not commensalism.

Answer:

B. Parasitism