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9 January, 12:42

Unlike amphibians, reptiles

A. use single-loop circulatory system.

B. have a closed circulation system in which blood circulates entirely within blood vessels.

C. have ventricles that are further divided to lessen mixing of oxygen-rich and oxygen-poor blood.

D. have lungs to oxygenate blood.

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  1. 9 January, 13:09
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    Unlike Amphibians all reptiles have lungs which are modified in certain instances but they all do have lungs.
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