I believe the correct answer would be C. Sartorius i believe this is the answer, after doing some research on gO0gLe.
Although nitrogen gas makes up 78% of the atmosphere, we can't use it because nitrogen atoms must be broken apart first before. This nitrogen is very much packed and bonded with its atoms and would be useless to use since it can't be used for plants.
The consumers have a lot of choices for them to eat!
Animals need more food when it’s cold because the cold is very cold and it can be racist so that’s why animals need more food when it’s cold