AP Document-Based Question Climate change studies involve many complex factors.
A Explain TWO advantages and TWO disadvantages of doing
laboratory studies on climate change.
B Compare field studies to laboratory studies for investigating
climate change.

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.

answer: 45

explanationyou have to add as well to be it could be

i dont know it at allnow im just getting points at this pint