Question

the separation of right side and left side of the heart is useful to prevent oxygenated and deoxygenated blood from mixing example of animals having this property is

Answer 1

in body of human beings the blood flowing in viens and arteries vein carries oxygenated blood and arteries carries deoxygenated blood
If oxygenated blood mixes with deoxygenated blood then oxygen mixes with carbon dioxide &there is no oxygen for aerobic respiration.
then all the cells present in human body will died &hence person will also be died.

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Answer 2

In body of human beings the blood flowing in viens and arteries vein carries oxygenated blood and arteries carries deoxygenated blood

If oxygenated blood mixes with deoxygenated blood then oxygen mixes with carbon dioxide & there is no oxygen for aerobic respiration.

then all the cells present in human body will died &hence person will also be died.