Artificial selection can be used to produce new strains of animals that have favorable traits. Despite its usefulness, it would be difficult to use artificial selection to produce cows that produce their own antibiotics to protect themselves from disease. Why can’t artificial selection be used for this purpose? A. Antibiotics are used only in humans and not in cows.
B. The pathway for antibiotic production requires too many enzymes for selection.
C. Cows do not possess the specialized organs used by other creatures to produce antibiotics.
D. A gene for producing antibiotics does not appear in the cow population and therefore cannot be selected for.

b

Explanation:

because it makes sense

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.