In an experiment to test how light affects plant growth, a student placed one plant in a dark cupboard and another in a sunny window. What is the one factor that should be kept the same for both plants to make this a fair test?
SAMPLE 2
A student wants to find out if the size of a parachute affects how fast it falls. She uses a large parachute and a small parachute. What is the one thing she must change in this experiment?
SAMPLE 3
In an experiment to test how temperature affects the rate of dissolving sugar in water, a student uses hot water and cold water. What is the one thing that must be measured to get the results?
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