Amaterial that has definite volume but no definite shape is classified as a

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?

Environmental differences within ecosystems are generally caused by

How does an angiosperm prevent self pollination