Ecology is the study of between living things and their environment. A is the place where a plant or an animal lives. Plants that make their own food are known as . Consumers are that feed on plants or other organisms. An animal that eats plant material only is known as a , while an omnivore eats both plants and . A is an organism that feeds on dead plants and animals. A food consists of organisms laid out in the order in which one is eaten by the other. A structure that helps an organism to survive is known as an . is the struggle between species for limited in a habitat. Two or more food chains make up a food . Interdependence is where species rely on each other to .