How do fossil fuels contribute to air pollution? A. by releasing carbon dioxide into the air
B. by recycling oxygen
C. by reversing the greenhouse effect
D. by releasing nitrogen into the air

The oxidizing agent our bodies use to obtain energy from food is oxygen (from the air). if you breathe 15 times a minute (at rest), taking in and exhaling 0.5 l of air with each breath, what volume of air do you breathe each day? air is 21% oxygen by volume. what volume of oxygen do you breathe each day?

What occurs to the cell during mitosis

Earthquakes a.created the rock in arches utah b.can be caused by volcanic eruptions c.are caused by tsunami waves d.wear mountains down into hills