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What's the difference between independent, dependent, and controlled variables?

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I'm doing my science project where i'm comparing what makes plants grow the fastest & healthiest. I'm using a plant with Riverbank Zoo's Compose, Scott's Fertilizer, and a plant with just dirt. There winter plants, and I water them every two days. The Scott's killed the plant and the RiverBank's Compose and the just dirt plant are thriving. I always have a issuse with chosing which is Indenpent,dependent, & controled. PLease help me and explain.