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| part of a number sentence without an = sign |
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| a letter or symbol that stands for an unknown number |
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| number sentence saying two amounts are equal |
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| something that surrounds living thing |
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| is a measure of energy of lives |
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| a gas plant use to make food |
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| a source of nourishment especially in food |
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| the process plant use to make their own food |
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| an animal that feeds chiefly on plants |
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| an omnivorous person or animal |
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| tiny living things that break down dead organisams |
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| animals that must eat other plants/animals |
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| plants that make their own food |
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| a food chain shows how energy passes from one organisams to another as food |
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| a complex of food chains in an ecoligcal population |
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| the act of competing,as for a prize rivalry |
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| the geometric expansion of a biological population |
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