A greenhouse gas is a gas that absorbs and emits radiant energy within the thermal infrared range, causing the greenhouse effect. The primary greenhouse gases in Earth's atmosphere are water vapor, carbon dioxide, methane, nitrous oxide, and ozone
The answer is:
Age
This is because if your young your organs are not as developed. When your older your body handles more because it is developed fully.
I would advise you do more research on .gov websites. But I don't believe they will take anything other than a State I.D.
