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(Physical things)
? The various forms of matter are composed of one or more chemical elements.
Element: A pure substance that cannot be broken down into smaller substances by chemical means
? There are 25 elements are essential to life. Four of these elements are Oxygen (O), Carbon (C), Hydrogen (H), and Nitrogen (N). These make up about 96% of the living matter in your body. Calcium (CA), Phosphorus (P), Potassium (K), sulfur (S), and a few other elements account for most of the remaining 4%.
Trace Elements: elements that make up less that 0.01 percent of your body mass are nevertheless critical to your health...
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