Martin gets a's (95100) on all of the writing assignments that he does, but he has skipped half of the writing assignments. in discussing his grades with a friend, he says "i must have a c in writing, because i have a's on half the assignments, and f's on the other half." but martin is worse off than he thinks. he actually has an f in writing. his grade is f because:
a) each student's highest and lowest score were dropped. b) the teacher assigned a zero for every missing assignment. c) the teacher used a system of scoring that is unreliable. d) the teacher was using absolute grading standards.

B) the teacher assigned a zero for every missing assignment

sunlight and water

explanation:

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.