The circulation of blood refers to its continual flow from the heart, through branching arteries, to reach and traverse the microscopic vessels in all parts of the body, reconverging in the veins and returning to the heart, to flow thence through the lungs and back to the heart to start the circuit.
There is a debate if viruses are alive because a virus contains its own DNA. However, most consider it to not be alive, since it cannot reproduce on its own.
Answer:
It is the nucleus of each cell where the DNA molecule is packed into thread like structure which is called chromosome.
Explanation:
Answer:
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Explanation:
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