Question

select the text from the paragraph that best helps you understand that viable means usable. 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 question asks for text that shows "viable" means usable. The phrase that links the parasite's habitat to supporting its life cycle (a usable function) is the relevant part, as it defines the habitat as functional/suitable (usable) for the parasite's needs.

Answer:

"the parasite gains a viable habitat to support its life cycle"