Concept:An endo-parasite is an organism that lives inside the body of its host.
Explanation:The tapeworm lives in the intestine of humans or other animals.
This makes it an internal parasite, or an endo-parasite.
A flea and a tick live on the outside of their host’s body and feed on its skin or blood.
These are examples of ecto-parasites, not endo-parasites.
An aphid feeds on plant sap but remains on the plant surface, so it is also not an endo-parasite.
Only the tapeworm is correctly described as an endo-parasite.
Answer:A. Tapeworm