what helped human respiratory system not available i mean in humans respiratory system is not available what happened???
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Respiratory failure is a serious condition that develops when the lungs can't get enough oxygen into the blood. Buildup of carbon dioxide can also damage the tissues and organs and further impair oxygenation of blood and, as a result, slow oxygen delivery to the tissues.
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If human respiratory system was absent then there would be no blood circulation and each organ will be exhausted by oxygen deficiency
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