I believe it is a solution but I am not Shure
Answer:
Atoms: <em>they are tiny particles that are the basic building blocks of any substance. The atoms are themselves made up of even smaller particles-protons, neutrons and electrons. </em>
Molecules: <em>it is the smallest unit of matter, which can exist independently. A molecule is formed when two or more atoms combine together.</em>
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<em>hope it helps</em>
<em>and ur welcm</em>
<em>:)</em>
Fossil fuels is the answer