Mr. miller's biology class is studying cellular respiration. to model cellular respiration, they set up an experiment containing four flasks. each flask is the same size and are stoppered and placed under a floodlight. each flask also contains 200 ml of h20 and 2 ml of bromothymol blue. bromothymol blue is a chemical indicator solution that changes color from blue to yellow in the presence of co2. the students then place a plant and fish into each flask according to the table above. which flask(s) will turn yellow and why?

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.