What are the oval-shaped structures that can be found all over the microscopy slide pictured below?.

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?

The chemical form of energy that is useable by the cell to do work

Which of the organisms listed below performs nitrogen fixation? a. legumes b. plants c. bacteria d. fungi