Fleas are wingless insects that undergo complete metamorphosis with four stages: egg, larva, pupa, and adult. Fleas prefer a warm, humid environment, with temperatures ranging between 70° and 90° Fahrenheit and a relative humidity of 75% or more. Under ideal conditions, the cat flea life cycle takes just 18 days, from egg to adult. Fleas require a blood meal on a regular basis. They prefer blood from your pet, but they will also fleas will bite you! Bites are common around a person’s ankles or on their feet. The bites itch! The female flea may deposit up to 50 eggs per day on your dog or cat. As your pet walks around your home, many of the flea eggs fall off. Flea eggs are tiny so they can go unnoticed in your pet's bedding, in carpets, or on upholstered furniture.
According to the passage, the flea is a ____________ and your pet dog is the ____________.
A) host; prey
B) parasite; host
C) parasite; prey
D) predator; prey