Nitrogen fixation occurs when which of the following happens? -Plants break down the nitrogen and use it as a nourishing sugar.
-Plants absorb the nitrogen from both the soil and the air.
-Bacteria absorb nitrogen and release it as carbon dioxide.
-Bacteria convert nitrogen to a form that plants can use.

How did the mountains on the oregon trail influence the timing of pioneers’ travels? a.) the pioneers wanted to avoid times when there was snow in the mountains. the pioneers wanted to spend as much time as possible enjoying the mountain scenery. b.) the pioneers crossed the mountains in late fall when the trees were bare and the views were good. c.) the pioneers were rugged people who were not impacted by the terrain they crossed at any time.