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1
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substances that provide the body with necessary chemicals
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2
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form of energy
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3
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gas that makes up one fifth of ordinary air
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4
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chemicals consit of microscopic particles
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6
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water, foods,oxygen, heat, pressure
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7
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complex structures with specialized functions
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9
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most abundant chemicla in the body
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10
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a basic unit of structure
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11
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stimuli in the internal environment
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13
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made up by organ systems
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18
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made up by groups of cells
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20
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responses that alter conditions in the internal environment
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21
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the branch of science that deals with the structure of body parts
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