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a symbiotic relationship in which one organism benefits while the other is not affected
a state in which an organism is inactive while it awaits more favorable conditions in its environment
the natural process by which one community of living things is replaced by another community in an orderly, predictable sequence, until a stable climax community appears
a sleeplike state of reduced body activity that some animals enter to survive the winter
a physical characteristic that enables an organism to survive under a given set of conditions
a relationship in which two or more different organisms live in close association with one another; that is, when one organism lives on or inside another one
Living things and the nonliving things in their surroundings make up an ecosystem. Adaptations allow an organism to survive in a particular ecosystem.
Green plants use sunlight to make their own food. They are called producers. Animals depend on other organisms for food. They are called consumers. All organisms get their energy directly or indirectly from the sun.
Decomposers are organisms that break down the remains of dead plants and animals. Decomposers return nutrients to the environment.
Producers, consumers and decomposers may be linked in a food chain. Disturbing any part of a food chain affects other organisms the food chain.
There is a constant exchange of materials between an organism and its environment; these materials include food, water, oxygen and wastes.
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