Molecules are made up of more than one

a. proton
b. electron
c. atoms
d. neutron

c, atoms

Explanation:

Molecules are made up of atoms that are held together by chemical bonds. These bonds form as a result of the sharing or exchange of electrons among atoms. The atoms of certain elements readily bond with other atoms to form molecules. Examples of such elements are oxygen and chlorine.

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b) mutualism

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