What are the Independent, Dependent, and Controlled Variables?
I am observing the different stages of cell division by observing the tip of an onion root under a microscope and the time spent in each cycle.

During its completed cell division cycle, the onion root cell will have spent 68% in Interphase, 16% in Prophase, 6% in Metaphase, 4% in Anaphase, 4% in Telophase, and 2% in Cytokinesis.

What are the independent, dependent, and controlled variables of the onion roots cell division?
For more info my lab report is attached