Which two molecules are compounds? nahco3 o3 cl2 c8h18

Answer : The correct options are, and

Explanation :

Molecules of element : It is defined as a pure substance that is composed of atoms of similar elements.

For example :  etc.

Molecule of compound : It is defined as a pure substance that is made from atoms of different elements combined together in a fixed ratio by mass.

For example :

Form the given options, and are the compounds. While the other options, and are the molecule of elements.

Hence, the correct options are, and

well

explanation:

the answer is d.) homologous; have mammary glands