Which of the following is a true statement about hypotheses? a. it is not possible to test hypotheses through scientific investigations. b. even if hypotheses are not supported by data, they can still be valuable. c. if data does not agree with a hypothesis, the hypothesis should be changed to match the data. d. data collected during scientific investigations must always support hypotheses.

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.

answer; the tunica intima also called tunica interna, consists of elastic fibers,connective tissue and smooth muscle cells;