Which of the following parasites lives inside the body of its host?

The correct answer is "ascaris." Ascaris is a type of parasite that lives inside the body of its host. Specifically, it lives in the small intestine of humans and other animals. Ascaris is a type of roundworm that can grow up to 35 cm long and lay up to 200,000 eggs per day. These eggs are passed out of the host's body through their feces, which can then contaminate soil and water sources, leading to further infections. Mites, lice, and ticks are external parasites that live on the outside of their hosts. Mites are typically found in skin, hair follicles, and other areas on the surface of the host's body. Lice are commonly found on the hair and scalp of humans and other mammals. Ticks are known for burrowing into the skin of their hosts, where they can feed on blood for extended periods of time. To put it simply, Ascaris is the only option that lives inside the body of its host, specifically in the small intestine. The other options - mites, lice, and ticks - are external parasites that live on the outside of their host's body.