Question

Please answer any of these (12-15) My teacher gave us homework from a book we don't have.

Answer 1

12. B. photosynthesis
13. C. The ocean
14. E. Both b and c
15.  A. Atomospheric nitrogen


hope this helps

Answer 2

12. Photosynthesis
13. In the atmosphere
14. Both b and c are correct
15. organic nitrogen