Which of the following parasites is considered an endoparasite?

• A. Ticks
• B. Hookworms
• C. Fleas
• D. Mites

Answer: (B)

Endoparasites are parasites that live inside the host’s body. Hookworms reside in the animal’s small intestine, where they attach to the mucosa and feed on blood, making them an internal parasite. The other organisms listed—ticks, fleas, and mites—live on the outside of the body (on the skin or in the fur), so they are considered ectoparasites. Because hookworms dwell inside the gut, they best fit the endoparasite category.