Where do plants get the nitrogen they need to create amino acids and DNA? A. Plants get their nitrogen from nitrogen gas (N2), which moves into leaves through holes called stomata.

B. Plants take up nitrates (NO3-) from the soil and convert them into ammonia (NH3).

C. Nitrogen-fixing bacteria convert nitrogen gas (N2) into ammonia (NH3), and plants take up some of the ammonia (NH3) through their roots.

D. Both B and C are correct.

E. A, B, and C are all correct.