John and Julie wanted to know if adding peat moss to sand would affect its ability to hold water. They put 200mL of sand into container A. They put a mixture of 80% sand and 20% peat moss into container B. They put a mixture of 60% sand and 40% peat moss into container C. They put a mixture of 40% sand and 60% peat moss into container D. They then added water to each container and measured the amount of water the contents would absorb. What are the Independent, Dependent, and Controlled variables?

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