Question

select the text from the paragraph that best helps you understand that host means an organism that another organism lives on. there may be more than one correct choice.
parasitic relationships are often the most familiar types of symbiotic relationships. a common example is a flea living on a dog. in cases like these, the parasite gains a viable habitat to support its life cycle, while the host is harmed.

Explanation:

The text "a flea living on a dog" shows one organism (flea) living on another (dog). The dog is the host as it's the organism the flea lives on.

Answer:

a flea living on a dog