Answer:
An element contains just one type of atom. A compound contains two or more different atoms joined together. A mixture contains two or more different substances that are only physically joined together, not chemically. A mixture can contain both elements and compounds.
The main chemical compound cells use for energy is Adenosine Triphosphate (ATP)
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Mass = 3 g
Volume = 3 mL
Density = mass / volume
D = 3 / 3
D = 1,0 g/mL