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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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