Question

select the answer from the menu.
calcium carbonate (caco₃) is considered a compound because it is made up of two or more
dropdown menu with options: molecules, elements, gases, solids

Explanation:

A compound is defined as a substance made up of two or more different elements chemically bonded together. Calcium carbonate ($\text{CaCO}_3$) consists of calcium (Ca), carbon (C), and oxygen (O) elements. The other options (molecules, gases, solids) do not fit the definition of a compound's composition basis. Molecules can be part of compounds but the key for a compound's definition is elements. Gases and solids refer to states of matter, not the compositional basis of a compound.

Answer:

elements