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The universe is energy. Energy 1 _______ in a variety of forms that include everything, from an atomic particle to a group of galaxies. Everything around us is matter and matter is 2 _______ from atoms.
We know over one 3 _______ kinds of basic atoms. They correspond to basic elements like nitrogen, oxygen, carbon, and others. An atom is a unit of matter.
Atoms form groups called molecules. Different 4 _______ of atoms or molecules created different kinds of matter. An oxygen molecule, for example, is made from two oxygen atoms. A carbon dioxide molecule is made from two oxygen atoms and one carbon atom.
comes
made
hundred
combinations