The answer to this question would be: <span>during pregnancy
Body metabolic rate will be increased during pregnancy because the mother needs to supply the child needs too. In reduced-calorie diet, the body will adapt to the hunger by lowering the basal metabolic rate. The basal metabolic rate also will be decreased as we age and when we are sleeping.</span>
Explanation:
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Irrigation system gave the ancient civilizations fertile land which helped crops grow. It also allowed for ease of watering which made the process of farming faster.