A scientist testing the effects of chemical fertilizer on apple trees sprays part of an orchard (50 trees) with the fertilizer. Another part of the orchard (also 50 trees) does not receive the fertilizer. In the fall the number of apples harvested from each part of the orchard is counted. The part of the orchard with the chemical fertilizer averaged 62 apples per tree. The part of the orchard without the fertilizer averaged 45 apples per tree.

In order for this test to be valid (fair) both orchards must:

A. receive different amounts of fertilizer

B. have different species of apple trees

C. receive different amounts of water

D. have the same species of apple trees

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.

human didn't come from monkeys man i hate these stupid teachers

the scientific method.