what do you mean by double circulation?
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The majority of mammals (including humans) utilize a double circulatory system. This means we have two loops in our body in which blood circulates. One is oxygenated, meaning oxygen rich, and the other is deoxygenated, which means it has little to no oxygen, but a lot of carbon dioxide.....
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Humans in the animal kingdom, show the highest levels of specialization. In fact, birds and mammals show a specialized feature called as the double circulation. If you have guessed that this has something to do with the circulatory system, you are bang on target.
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