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1
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Is red and circulates around our body.
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2
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What occurs in urine and is a product of protein metabolism?
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5
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Which tube connect the bladder to the exterior?
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6
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The act of breathing.
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8
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What is produced by the direct combination of nitrogen and hydrogen gases?
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10
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What is it called when liquid passes through something to remove suspended impurities or recover solids?
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11
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To get rid of waste or harmful matters.
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13
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What is it called when a substance is destroyed which then makes energy available?
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15
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The outer layer of body keeping everything together.
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