Answer:
The birds and mammals
have evolutionary advancement as far as structure of heart is concerned. They
need more oxygen to live in terrestrial habitat.
In these animals,
the blood received by left and right auricles is oxygenated and deoxygenated
respectively. It passes towards the left and right ventricles and thus no oxygenated
and deoxygenated blood is mixed. The ventricles pump oxygenated deoxygenated
blood without mixing.
Thus, two
separate circulatory pathways are found thus this type of blood circulation is called
as double circulation, which include systemic and pulmonary circulation.
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