Answer: i would say the independent variable is the soil and the control variable is the seed because it stays the same in all of them to better understand the experiment while the dependent variable is the fertilizer.
Explanation: i am not completely sure but maybe someone else can also answer to verify it first
Cancer and Tumors...
........ Hope it helps, Have a good rest of the day:)
When researchers create lesions, they are destroying a piece of the brain.