Pedro is planning to model how changes in weather affect evaporation from lakes for his first experiment he wants to test how hu
midity affects the evaporation rate. he places one beaker with 300 mL of water in a dry area. and places another beaker with 300 mL of water near a humidifier which of the following variables does Pedro need to control during his experiment A. humidity only
B. humidity and evaporation rate
C. volume of water and tempature
D. volume of water only
