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Savvas Topic 5-Dupli

Ecosystems

TermDefinition
organism A living thing.
biotic factor A living or once living part of an organism's habitat.
abiotic factor A nonliving part of an organism's habitat.
ecosystem The community of organisms that live in a particular area, along with their nonliving environment.
producer An organism that can make its own food.
consumer An organism that obtains energy by feeding on other organisms
decomposer An organism that gets energy by breaking down biotic wastes and dead organisms, and returns raw materials to the soil and water.
food chain A series of events in an ecosystem in which organisms transfer energy by eating and by being eaten.
food web The pattern of overlapping feeding relationships or food chains among the various organisms in an ecosystem.
energy pyramid A diagram that shows the amount of energy that moves from one feeding level to another in a food web.
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