PLEASE HELP

Asked by narinder | 15th Mar, 2010, 01:33: PM

Expert Answer:

The separate channels ensure that oxygenated and deoxygenated blood do not mix. Such separation allows a highly efficient supply of oxygen to the body and is useful in endothermic animals like mammals and birds that have high energy needs.

Answered by  | 15th Mar, 2010, 04:20: PM

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