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4 Terms
1
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What are elements in chemistry?
Elements are substances that cannot be broken down into simpler substances by chemical means.
2
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Which four elements are primarily used to build biological molecules?
Oxygen (O), carbon (C), hydrogen (H), and nitrogen (N).
3
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What are trace elements?
Trace elements are elements required by an organism in very small quantities, such as iron (Fe), iodine (I), and copper (Cu).
4
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What are atoms?
Atoms are the unit of life and the building blocks of the physical world.
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