Q.Differentiate between predator and prey.

Step 1. The question asks to differentiate predator from prey, which is best answered by contrasting predation's own two roles against the related concept of parasitism, since the chapter defines predator/prey precisely by that contrast.

Step 2. In a predator-prey relationship, the predator is the animal that kills another animal (the prey) for food; the chapter notes the predator tends to be larger than its prey, and catches its prey from without (from outside the prey's body).

Step 3. By contrast — and this is exactly how the text distinguishes the two — a parasite is smaller than its host and consumes it from within, rather than by an outright kill; this is the key structural difference between predation and parasitism as interaction types. …

Differentiate predator from prey by role (kills vs is killed) and use the text's predator-vs-parasite size/ …

• Defining predator and prey only by 'who eats whom' without capturing the relative-size and from-without-versus-from-within disti …