All stages respiration occur in every single cell.
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Answer:
They carry blood which is low in oxygen and high in carbon dioxide into your lungs so that the carbon dioxide can be blown off, and more oxygen can be absorbed into the bloodstream. it is pumped all around your body to supply oxygen to cells and organs.
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The answer to this question in the phase Interphase when the chromosomes replicate to form joined sister chromatids , and also the dna gets replicated