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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Tadpoles start off having gills like a fish but the older they get there gills start to disappear they breathe like fish because they do have gills as younglings.
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You need to be more clear when asking questions
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Yes
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Fred should be concerned because 12 months isn't an average, it's more of a deadline.