The statement that a certain percentage of body fat is essential for the body to function effectively is true. Making, breaking, storing and mobilizing fats is at the core of how humans and all animals regulate their energy. So, fats are essential for energy regulation. There are two types of body fat: storage body fat and essential body fat. Both of them are taken into account when calculating body fat percentage.
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The immune system is made up of special organs, cells and chemicals that fight infection (microbes). The main parts of the immune system are: white blood cells, antibodies, the complement system, the lymphatic system, the spleen, the thymus, and the bone marrow.
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The answer is...
B) To ensure that you are constantly engaging your body in a way that improves its function
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