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A habitat is a natural home or environment of an animal, plant, or other organism. In this picture there is a pond and in the pond there is fish that live there. The fish in the pond are biotic because they are living.

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Decomposition is the process by which organic substances are broken down into simpler organic matter. Bodies of living organisms begin to decompose shortly after death. Animals, such as worms, also help decompose the organic materials.The plant in the picture is one of the first stages of decomposition.

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Abiotic factors non-living chemical and physical parts of the environment that affect living organisms and the functioning of ecosystems.

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Animal migration is the relatively long-distance movement of individual animals, usually on a seasonal basis. ... It is found in all major animal groups, including birds, mammals, fish, reptiles, amphibians, insects, and crustaceans.

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An organism is an individual animal, plant, or single-celled life form.

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Biotic factors are the living components of an ecosystem. They are sorted into three groups: producers or autotrophs, consumers or heterotrophs, and decomposers or detritivores.

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Pollution is the presence in or introduction into the environment of a substance or thing that has harmful or poisonous effects. In this picture there is trash that doesn't decompose normally and is all around the bushes.

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A carnivore is a animal that feeds on flesh.

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Commensalism is an association between two organisms in which one benefits and the other derives neither benefit nor harm.

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11. Evidence of human impact on environment

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11. Evidence of human impact on environment

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Evidence of human impact on the environment is this tree trunk that has been cut off by workers.

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A deciduous plant is a plant that turns orange and loses it leafs in fall and grow its leafs back. In this picture the plant is starting to turn orange and the leafs look dead.

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Biodiversity is the variety of life in the world or in a particular habitat or ecosystem.

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Precipitation is a deposit on the earth of hail, mist, rain, sleet, or snow.

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A reservoir from which no outflow of carbon compounds takes place is called carbon sink.

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A population is all the inhabitants of a particular town, area, or country.

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A herbivore an animal that feeds on plants.

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A primary consumer is an organism that feeds on primary producers.

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Competition is an interaction between organisms or species in which both the organisms or species are harmed. Limited supply of at least one resource (such as food, water, and territory) used by both can be a factor.

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An adaptation is a mutation, or genetic change, that helps an organism, such as a plant or animal, survive in its environment.

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A secondary consumer consumes the animals that eat only plants