Which of the following accurately describes both elements and compounds?

Both elements and compounds are indeed composed of atoms, which is why the answer is accurate. An element consists of only one type of atom, which cannot be broken down into simpler substances by chemical means. On the other hand, a compound is a substance formed when two or more different types of atoms bond together in a fixed ratio. This fundamental characteristic of being made up of atoms applies to both categories.

Molecules are formed by the bonding of atoms, but not all elements exist as molecules. For instance, noble gases like helium exist as single atoms. Similarly, while many compounds indeed consist of molecules, others can form ionic structures that do not have distinct molecules. Consequently, stating that both elements and compounds are made of molecules does not accurately encompass their definitions.

Regarding the composition of multiple types of atoms, only compounds fit this description while elements do not, as they consist of only one type of atom.

Lastly, defining elements and compounds solely in terms of being solid substances is misleading since both can also exist in liquid or gaseous states, depending on environmental conditions. Thus, while the physical state varies, the defining characteristic of being made of atoms consistently applies to both elements and compounds.