In order for plants to assimilate nitrogen directly into their system, the nitrogen must be in the form of nitrates. Nitrogen in the air and ammonia from decayed matter in the soil is converted to ammonium by decomposers and nitrogen-fixing bacteria. The ammonium is further nitrified to nitrates by nitrifying bacteria. Finally, the nitrates can then absorbed by the plants.
( C ) -That the spontaneous generation doesn’t happen
I believe the answer is The second one, They have greater access to food in northern regions during the summer.
Hope this helped :)
