The answer is going to be the letter D, nitrogen. I hope this helps!!
When two experiments are identical except for one variable, the experiment is called a controlled experiment
Answer:
I think air molecules and water but I don't know
Explanation:
In my opinion, the correct answer among the choices listed is option C. The members of the kingdom Protista are least similar to a bacteria. Protists are eukaryotic organisms which cannot be classified as a fungus, animal, or a plant. They are mostly unicellular organisms.