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Posted by on Thursday, February 4, 2010 at 7:31pm.

compare digestion and respiration.

how would unhealthy teeth or germs affect digestion.

how are the digestive and circulatry system alike.

explain how the heart and lung help each other provide oxtgen to the body.

  • science - , Thursday, February 4, 2010 at 7:46pm

    I will be happy to check your thinking or work. All of this should be in your text.

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