Question

question 9 of 10
pedro is planning to model how changes in weather affect evaporation from lakes. for his first experiment, he wants to test how humidity affects the evaporation rate. he places one beaker with 300 ml of water in a dry area, and he places another beaker with 300 ml of water near a humidifier.
what is the independent variable in pedros experiment?
a. evaporation rate
b. volume of water
c. temperature
d. humidity

Explanation:

An independent variable is what is changed in an experiment. Pedro is changing humidity to test its effect on evaporation rate. Volume of water is constant, and temperature isn't mentioned as being manipulated.

Answer:

D. Humidity