The living and nonliving things in an area that interact with one
 another and with their environment are a community.
 a. true
 b. false
 17 Answer: 
 Predation is a relationship in which one organism lives on, near,
 or inside another organism.
 a. true
 b. false
 18 Answer: 
 Herbivores return matter to the environment from the bodies of dead
 plants and animals.
 a. true
 b. false
 19 Answer: 
 Organisms that eat only plants are called omnivores.
 a. true
 b. false
 20 Answer: 
 The base of an energy pyramid consists only of autotrophs.
 a. true
 b. false