What is the purpose of using multiple control groups in an experiment?
o
a. to generate as much data as possible, whether they're useful or
not
o
b. to scientists make observations that are not relevant to the
experiment
o
c. to control for factors that aren't being tested but might affect
results
o
d. to provide background information concerning the experimental
question
submit

C is the answer.

Explanation:

A control group is a group separated from the rest of the experiment such that the independent variable being tested cannot influence the results.

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.

the generally accepted parts of modern cell theory include: all known living things are made up of one or more cells. all living cells arise from pre-existing cells by division. the cell is the fundamental unit of structure and function in all living organisms.