Are you scientifically literate? Take our quiz

You may have an opinion on climate change, evolution education, stem-cell research, and science funding. But do you have the facts to back up your opinion? This quiz will test your basic scientific literacy.

1. Composing about 78 percent of the air at sea level, what is the most common gas in the Earth's atmosphere?

Steve Helber/AP
(Read caption)

Carbon dioxide

 

Oxygen

 

Nitrogen

 

Hydrogen

 
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