Which statement best explains the meanings of the related words in the paragraph? An element is made up of only one kind of atom. A compound is made up of two or more elements. These are the building blocks of all substances. For example, with two atoms of the element of hydrogen and one atom of the element of oxygen, we have water. The words tell that hydrogen in water has two atoms. The words explain how to make water. The words explain what is in an atom. The words describe the building blocks of substances. in vocabulary!