Which best describes a molecule?
1.a unit made of different kinds of elements.
2.a unit made of only one kind of element
3.a unit made of two or more atoms
4.a unit made of a single atom

Answer :

3.a unit made of two or more atoms is the correct statement. 

Hope this helps!!
It is the first one because water is considered a molecule and it has 2 different types of atoms 

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