Explanation:
the most complex energy system is the aerobic or oxygen energy system which provide mass of the body's ATP
<span>A geographer is someone who studies the earth and its land, features, and inhabitants. They also examine phenomena such as political or cultural structures as they relate to geography. They study the physical or human geographic characteristics or both of a region, ranging in scale from local to global.</span>
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Explanation:
urban civilization had existed at the same time as Egyptian and. The people of this Indus Valley civilization did not build massive monuments. Very few weapons have been found and no evidence of an army has been discovered.
