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Which of the following is the dependent variable in the experiment described below?
A scientist discovers a new species of snail that lives in the ocean. He tested the ability of this species to handle heat by measuring its growth rate as he increased the temperature of the water. He also tested two different concentrations of salt to determine which type of marine environment the snail would be best suited for.

A growth rate

The growth rate is the variable that is dependent on the changes to water temperature and concentration of salt in the water.