The answer to this question is Vitamin D. Vitamin D is considered a vitamin and a hormone. Vitamin D can help develops the bones and teeth and it can also boost our immune system when a person have a sufficient amount of vitamin d in the body. Also vitamin d helps our immune system to resist diseases such as diabetes and cancer.
Answer:
The arrector pili muscles contract (piloerection) and lift the hair follicles upright. This makes the hairs stand on end, which acts as an insulating layer, trapping heat.
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The answer is free energy..........
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