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Savvas Topic 5

Ecosystems

TermDefinition
organism A living thing.
habitat An environment that provides the things a specific organism needs to live, grow, and reproduce.
biotic factor A living or once living part of an organism's habitat.
abiotic factor A nonliving part of an organism's habitat.
population All the members of one species living in the same area.
community All the different populations that live together in an area.
ecosystem The community of organisms that live in a particular area, along with their nonliving environment.
limiting factor An environmental factor that causes a population to decrease in size.
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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