Choose the 4 reasons that contributed to Mendel selecting the garden pea as his experimental subject. A. It is not possible to perform cross-pollination in peas.
B. There were a large number of pure varieties.
C. The garden pea had a relatively long generation time.
D. The garden pea had a relatively short generation time.
E. It was one of the few plants that can be grown in a garden.
F. Garden peas can self-fertilize.
G. Earlier investigators had produced hybrid peas.

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.

the answer will be a) proteins i believe