Which best defines nitrogen fixation? A. The process of creating free nitrogen for plants to absorb

B. The breakdown of nitrogen in the soil

C. The conversion of nitrogen gas into a usable form

D. The destruction of the bonds between nitrogen and other elements

PLEASE HURRY

Galaxy whose shape seems different follow no set pattern are classified as

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?

Describe two recent or ongoing space missions.