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#11
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| Thanks for arouse my imagination |
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#12
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| Thanks for arouseing my imagination |
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#13
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| The correct answer is C. Bacteria make certain vitamins. They also break down complex carbohydrates, so that we humans can extract more energy from our food. |
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#14
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| Last edited by admin; 03-01-2011 at 03:10 AM. |
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#15
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| I agree with this opinion,some of the bacterias are helpful to our system,some are not,I'm not a professional,it's about keeping balance in the system,not all good ,or all bad. |
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#16
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#17
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| ok, hope u can share the knowledge in near future,keep done! |
| Tags |
| bacteria , benefit , digestive , humans , living , system |
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