answer:
it took 17,000 years for CO2 to go from 200 to 300 ppm.
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B is better because it has more surface area.
Hydrogen and helium are the two most abundant elements in the sun.
A unicellular protist is a eukaryotic cell because it has a nucleus enclosed by a membrane. Protist cannont be grouped with plants, animals or fungi. However they are still eukaryotic.
