<span>simple organic molecules can form spontaneously under conditions like those thought to prevail early in Earth's history</span>
Most of all cell enzymes are proteins
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I believe the answer is D.
Carbon dioxide is emitted as a by-product of clinker production an intermediate product in cement manufacture, in which calcium carbonate (CaCO3) is calcinated and converted to lime (CaO), the primary component of cement. CO2 is also emitted during cement production by fossil fuel combustion.
