Question

a tick and a dog have this type of relationship.
parasitism
mutualism
predation
commensalism

Explanation:

To determine the relationship between a tick and a dog, we analyze each ecological interaction:

• Parasitism: One organism (parasite) benefits at the expense of another (host), causing harm. A tick feeds on a dog's blood, harming the dog (e.g., causing irritation, transmitting diseases) while benefiting (getting nutrients).
• Mutualism: Both organisms benefit. A tick - dog relationship does not benefit the dog, so this is incorrect.
• Predation: One organism kills and eats another. Ticks do not kill dogs for food in the typical predation sense, so this is incorrect.
• Commensalism: One organism benefits, and the other is unaffected. Ticks harm dogs, so this is incorrect.

Answer:

A. parasitism