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abiotic non-living autotroph organism that can capture energy from sunlight or chemicals and use it to produce its own food from inorganic compounds; also called a producer biosphere part of Earth in which life exists including land, water, and air or atmosphere biotic living carnivore eats only meat community (ecology) a group of interdependent organisms inhabiting the same region and interacting with each other consumer organism that relies on other organisms for its energy and food supply; also called a heterotroph decomposer an organism that gets energy by breaking down the remains of dead organisms or animal wastes and consuming or absorbing the nutrients detritivore organism that feeds on plant and animal remains and other dead matter ecosystem collection of all the organisms that live in a particular place, together with their nonliving environment energy pyramid a diagram that shows the amount of energy that moves from one feeding level to another in a food web food chain series of steps in an ecosystem in which organisms transfer energy by eating and being eaten food web a diagram that shows the feeding relationships between organisms in an ecosystem herbivore any animal that feeds chiefly on grass and other plants heterotroph organism that obtains energy from the foods it consumes; also called a consumer omnivore organism that obtains energy by eating both plants and animals population a group of organisms of the same species populating a given area producer organism that can capture energy from sunlight or chemicals and use it to produce food from inorganic compounds; also called an autotroph quaternary consumer a meat-eater that eats tertiary consumers species group of similar organisms that can breed and produce fertile offspring ten percent law only about 10% of the energy available within 1 trophic level is transferred to the next trophic level. trophic level each step in a food chain or food web