in mammals and birds why is it necessary to separate oxygenated and deoxygenated blood
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In mammales and birds it is necessary to separate oxygenated blood and deoxygenated blood because we are not cold blooded animals and every part of our body needs oxygen and if we don't get it adiquate amount we will die.
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It is necessary to separate oxygenated and deoxygenated blood to maintain efficient supply of oxygen into the body. This system is essential in animals that have high energy need. For example, animals like mammals and birds which constantly use this energy to maintain their body temperature.
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