Why is it necessary to separate oxygenated and deoxygenated blood in mammals and birds?

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➷ It makes the circulatory system more efficient and helps to keep a constant body temperature. It allows an efficient supply of oxygenated blood to the body cells.

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When a virus infects a host cell, it uses the cell's machinery to make copies of its own genetic material in a process called replication. finally, during the process of self-assembly, that protein shell and the copies of the virus's genetic material are assembled into new viruses.