Final answer:
Water (H2O) is an example of a substance that starts at the molecular level, as it consists of both hydrogen and oxygen atoms bonded together to form a molecule.
Step-by-step explanation:
An example of something that is started on the molecular level as opposed to the atomic level is C. water. This is because water (H2O) is a molecule that is composed of both hydrogen and oxygen atoms. It is the chemical building blocks of all body structures, including proteins and sugars found in living things. In the case of water, each molecule is made up of one oxygen atom, which has eight protons in its nucleus, and two hydrogen atoms, each with one proton in their nuclei. This arrangement and the resulting polar nature of the water molecule are due to the interactions between these atoms at the molecular level.