Molecules .
A) are named according to the alphabet
B) are the smallest units of matter
C) must be made of two different elements
D) are made of two or more atoms

D

Explanation:

A is incorrect because they are named by elements and the number of atoms.

B is incorrect because the smallest units of matter are usually considered to be atoms.

C is incorrect because O2 is considered a molecule, and is made of only one element.

So, D is correct, because molecules are groups of two or more atoms that are held together by chemical bonds.

yes

explanation:

search chemistry final b exam in google and a site called quizlet will pop up

the answer is a and have a great day