Ava’s mother is an engineer. Ava was curious about the ways technology or engineering might be able to reduce the amount of carbon in the air. Which of the following is an engineering process that would reduce carbon in the air? A. Increase the use of current alternative energy sources.
B. Develop cooperation with other governments.
C. Reduce the use of fossil fuels.
D. Filter carbon and store it underground.
help!!!

reduce use of fossil fuel

step 1 ammonium can be absorbed by plants, but some is converted into nitrates which are better for plants to absorb. this is called nitrification. 2. step 2 the deer eats the plants and uses the nitrogen-containing proteins for cell growth. 3. step 3 bacteria in the soil conduct nitrogen fixation to convert nitrogen gas from the atmosphere into ammonium. 4. step 4 some of the nitrates are absorbed back into plants, but denitrification breaks down the nitrates into nitrogen gas released back into the atmosphere. 5. step 5 nitrogen is found in the urine, which gets broken down into ammonium through the process of ammonification. 6. step 6 plants absorb the ammonium and begin assimilation, the process to add the nitrogen to protein.