Answer:
B. Free-radical theory
Explanation:
The free radical theory statutes that <em>ageing is the result of the accumulation of the damage to cells and tissues caused by reactive oxygen species</em> as a result of aerobic metabolism.
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Mesopotamia is located in the portions of modern day Iraq and some of its neighboring countries, between the rivers Tigris and Euphrates.
The fertile crescent Crescent included Mesopotamia, Israel and Egypt.
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