The elements are substances that cannot be broken down into other matter by chemical means, and an atom is the fundamental particle in an element. As of 2001, there were 112 known elements, 88 of which occur in nature; the rest were created in laboratories. Due to their high levels of radioactivity, they exist only for extremely short periods of time. Whatever the number of elements—and obviously that number will increase over time, as new elements are synthesized—the same number of basic atomic structures exists in the universe.
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Making healthy food choices can help prevent dangerous bone loss, and food is .... More research is needed to understand the relationship between vitamin C and .... Salt causes the body to lose a little bit of calcium through what scientists call ...
To chew food, mostly for dogs.
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