An organism that lives on or in a host organism of another species. Parasites derive their food from and are detrimental to the host. Several examples of parasite-host relationships are: fleas living parasitically on mammals; mistletoe living parasitically on trees; the protozoan Plasmodium living parasitically in humans, for whom it causes malaria.

Sign in or register

For an ad-free experience and access the Visionlearning Classroom, sign in or register.