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OpenStudy (anonymous):
The kidneys remove which cellular waste product from blood? A. urea B. oxygen C. carbon dioxide D. undigested food materials
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OpenStudy (anonymous):
Which statement is true for both incomplete and complete digestive systems? A. Materials enter and exit through the same opening. B. Digestion begins outside the cells. C. The digestive cavity is like a tube. D. Continuous feeding is possible.
OpenStudy (anonymous):
no ones answering ur questions cause you put in to
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