Ecosystems
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| Biotic | A living thing
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| Abiotic | A nonliving thing
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| Ecosystem | All of the communities and their nonliving surroundings
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| habitat | a place where an organism makes its home.
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| Organism | one individual plant,animal or bacteria (living thing)
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| Population | a group of individuals of the same species living and interbreeding within a given area.
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| Community | populations of different kinds of organisms that live in the same place at the same time.
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| Biosphere | The part of the earth that contains all the ecosystems
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| Producer | an organism,as a plant that is able to produce its own food from inorganic substances
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| Consumer | an organism,usually an animal,that feeds on plants or other animals
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| Decomposer | an organism,usually a bacterium or fungus that breaks down the cells of dead plants and animals into simpler substances
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| Herbivore | An animal that eats only plants
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| Carnivore | an animal that only eats consumers
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| Omnivore | an animal that eats both plants and consumers.
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| Scavenger | an animal that feeds on carrion, dead plant material, or refuse.
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| Predator | an animal that lives by killing and eating other animals
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| Prey | an animal that is caught and killed by another for food.
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| Niche | a place, employment, status, or activity for which a person or thing is best fitted.
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| Biome | an area classified according to the species that live in that location
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| Terrestrial Ecosystem | a land-based community of organisms and the interactions of biotic and abiotic components in a given area.
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| Deciduous Forest | characterized by trees that lose their leaves at the end of each growing season.
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| Grassland | generally open and continuous, fairly flat areas of grass.
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| Rainforest | a hot, moist biome where it rains all year long.
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| Desert | an area, often covered with sand or rocks, where there is very little rain and not many plants.
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| Aquatic ecosystem | oceans, lakes, rivers, streams, estuaries, and wetlands.
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| freshwater | naturally occurring water that is not salty, and is suitable for consumption if clean or processed.
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| Pond | a small body of still water formed naturally or by hollowing or embanking.
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| Lake | a large body of water surrounded by land.
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| River/Stream | a large natural stream of water flowing in a channel to the sea, a lake, or another such stream.
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| Saltwater ecosystem | aquatic environments with high levels of dissolved salt.
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| Ocean | a very large expanse of sea, in particular each of the main areas into which the sea is divided geographically.
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| Saltmarsh | coastal wetlands that are flooded and drained by salt water brought in by the tides.
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| Estuary | the tidal mouth of a large river, where the tide meets the stream.
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| Food chain | a hierarchical series of organisms each dependent on the next as a source of food.
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| Primary consumer | animals that eat plants.
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| secondary consumer | The organisms that eat the primary consumers
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| tertiary consumer | The organisms that prey on the secondary consumers
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| Trophic levels | ranges from a value of 1 for primary producers to 5 for marine mammals and humans.
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| Autotroph | an organism that is able to form nutritional organic substances from simple inorganic substances such as carbon dioxide.
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| Heterotroph | an organism deriving its nutritional requirements from complex organic substances.
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| Food web | consists of all the food chains in a single ecosystem.
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| Energy pyramid | a graphical representation of the energy found within the trophic levels of an ecosystem.
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| Competition | the interaction of individuals that vie for a common resource that is in limited supply
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| Natural resources | materials from the Earth that are used to support life and meet people's needs.
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| Brackish | (of water) slightly salty, as is the mixture of river water and seawater in estuaries.
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