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About how many Americans suffer premature deaths related to smoking every year?

Lung cancer is the leading major cancer-related cause of death among women.

Cocaine enhances athletic performance involving strength or endurance.

One explanation for why high latitude locations receive less insolation is that it must travel through more of the atmosphere.  Because of this, there is a greater likelihood that the insolation will be scattered, reflected or absorbed by the material in the atmosphere.

The greatest portion of insolation that enters into the earth’s system, is absorbed at the surface.

Infrared EMR is what causes sunburns in humans.

_______ refers to the vertical flow of energy.

The gasses that compose the lower atmosphere (oxygen, nitrogen, carbon dioxide, etc.) are evenly mixed; there are not different layers of gasses based upon their relative weight.

At which of the following will the days (amount of daylight vs. darkness) be even?

Approximately h ow many ganglion cells does the human eye have?