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Mrs. Degl1 Human Excretory System Human metabolic waste includes carbon dioxide, water, salts, and urea. These wastes pass from the cells into the blood. - ppt download
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Animal biology. Zoology; Biology. 42 FUNDAMENTAL PRINCIPLES produce urea, a characteristic excretion of animals. In photosynthesis plants use up the available carbon dioxide and give off an excess of oxygen, while
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