A series of steps in which organisms transfer energy by eating and being eaten
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terrestrial ecosystem
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System of interactions between organisms on land (forests, meadows, deserts, etc.)
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prey
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An organism that is killed and eaten by another organism
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omnivore
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An animal that eats both plants and animals
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aquatic ecosystem
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ecosystems found in fresh or salt water.
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trophic level
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each of several hierarchical levels in an ecosystem, comprising organisms that share the same function in the food chain and the same nutritional relationship to the primary sources of energy.
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freshwater ecosystem
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ecosystems found in rivers, lakes, and streams where the water is not salty
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organism
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any living thing
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herbivore
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A consumer that eats only plants.
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predator
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An animal that lives mostly by killing and eating other animals
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carnivore
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A consumer that eats only animals.
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energy
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the ability to do work or cause change
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heterotroph
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organism that obtains food by consuming other living things; also called a consumer
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homeostasis
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A tendency to maintain a balanced or constant internal state; the regulation of any aspect of body chemistry, such as blood glucose, around a particular level
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food web
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(ecology) a community of organisms where there are several interrelated food chains
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consumer
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An organism that obtains energy by feeding on other organisms
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parasite
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An organism that feeds on a living host
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marine ecosystem
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an ecosystem found in oceans, seas and gulfs where the water has a salt content of at least 3.5%
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Autotroph
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organism that can make its own food
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producer
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an organism that makes its own food
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Photosynthesis
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The process plants and other organisms use to create energy form the sun
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decomposer
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organism that breaks down and obtains energy from dead organic matter