The paragraph is followed by an incomplete phrase or sentence which summarizes the main idea of the paragraph. Choose the missing words of the phrase or sentence.

Predators are usually bigger and fewer in number than the animals they prey upon. The reverse is true of parasites. These organisms live on or in other living things-their hosts, often spending an entire lifetime with them. In parasitism the parasite gets food and sometimes shelter, while the host gains nothing and may even suffer in some way from the relationship.
Predators live on the （） body.