Do you have an answer choice? If so please put and I would love to help you.
Answer:
Explanation:
Membrane bound organelles and eukaryotic
the answer to your question is the amount of time and the effect it has on each material as well as the fact that the nitrogen cannot change it is an unchangeable variable whereas everything else the time, the substance of the subject, the possible formation of nodules can change without changing the identity of the experiment itself otherwise, you have a dependent variable. I hope this helps :-)
