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doit_the_clown doit_the_clown
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7 years ago
Which major constituent of the atmospheres of Venus and Mars is present in only very small amounts in the Earth's atmosphere?
   A)  Methane, CH4    B)  Carbon dioxide, CO2    C)  Nitrogen, N2    D)  Oxygen, O2
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Discovering the Universe

Discovering the Universe


Edition: 7th
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Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

Albert Einstein
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hyponoticahyponotica
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7 years ago
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