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Pedro is planning to model how changes in weather affect evaporation from lakes. For his second experiment, he wants to test how winds affect the evaporation rate. He places one beaker with 300 mL of water in an area away from any fans, and he places another beaker with 300 mL of water near a small fan.Which of the following variables does Pedro need to control during his experiment?A.Movement of air onlyB.Temperature and volume of waterC.Movement of air and evaporation rateD.Temperature onlySUBMITarrow_backPREVIOUS

Question

Pedro is planning to model how changes in weather affect evaporation from lakes. For his second experiment, he wants to test how winds affect the evaporation rate. He places one beaker with 300 mL of water in an area away from any fans, and he places another beaker with 300 mL of water near a small fan.Which of the following variables does Pedro need to control during his experiment?A.Movement of air onlyB.Temperature and volume of waterC.Movement of air and evaporation rateD.Temperature onlySUBMITarrow_backPREVIOUS

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Solution

In Pedro's experiment, he needs to control the variables that could affect the evaporation rate other than the one he is testing, which is the movement of air. Therefore, he needs to control the temperature and volume of water. If these variables are not controlled, any changes in the evaporation rate could be due to these factors and not necessarily the wind. So, the correct answer is B. Temperature and volume of water.

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