Answer:
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For any terrestrial planet in the solar system, the core would be the densest layer, and the crust would be the least dense layer.
I'd say to help the reader quickly locate geographic regions.
Carbon Monoxide has 2 atoms total - one atom of carbon (C) and one atom of oxygen (O) chemical formula is CO
Ethylene has 6 atoms total, 2 atoms of carbon (C) and 4 atoms of hydrogen (H), chemical formula is C2H4.
Ethylene has four more atoms than carbon monoxide (6-2) = 4
