Answer:
1. In an experiment to test how the amount of sunlight affects the growth of radishes. The independent variable is the amount of sunlight each plant receives.
2. In an experiment to test the effect a gasoline additive has on gas mileage in a car, the amount of additive per gallon is the independent variable.
3. In an experiment to test the effect of eating carbohydrates on weight loss, the amount of carbohydrates eaten daily is the independent variable.
4. In an experiment to test the effect of sleep deprivation on student test scores, the amount of sleep a student would get nightly is the independent variable.
5. In an experiment to test the effect an insecticide has on keeping earwigs out of the house, the independent variable is the type of insecticide used.
Step-by-step explanation:
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