water is a(n)...\nnucleus.\natom.\nelement.\nmolecule.

Answer

Answer:

D. molecule

Brief Explanation:

Water is composed of two hydrogen atoms and one oxygen atom bonded together, forming a molecule. A nucleus is the central part of an atom, an atom is the basic unit of matter, and an element is a pure - substance made of only one type of atom. Water is a compound made of multiple atoms bonded, so it is a molecule.