Examlex
According to the Physical Activity Guidelines for Americans, children and adolescents should do ____ minutes or more of physical activity daily.
Compound
Substance having two or more different elements in a fixed ratio.
Molecules
Groups of two or more atoms held together by chemical bonds.
Nucleus
A membrane-bound organelle found in eukaryotic cells that contains most of the cell's genetic material.
Neutrons
Neutral, subatomic particles found in the nucleus of an atom, contributing to the atom's mass but not its charge.
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