Answer:
In four chambered
heart, left half is completely separated from right half by septa.
It serves following
two purposes
(a) ensures
complete segregation of oxygenated and deoxygenated blood (i.e., no mixing).
(b) allows a
highly efficient supply of oxygenated blood to all parts of the body.
This is
useful in warm blooded animals (like mammals and birds) which have high energy needs,
because they constantly require energy to maintain their body temperature.
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