Question

________ are pure substance made from a _____ type of atom and are the building blocks for all matter in the world.

Answer 1

Elements, then either specific, singular, or certain.

Step-by-step explanation:

Pure substances are just substances that are not mixtures, they are substances in their purest form. Elements, are substances in their purest form. For the second blank, elements are formed from a singular type of atom, or a specific or certain atom. It could be, one type of atom.

I hope this helps.