|John has pea plants. He is going to test how the amount of water he gives them affects their growth. What is one constant?
||Type of soil.
|John is testing the amount of sunlight his pea plants need to grow. What would the independent variable be?
||Amount of sunlight.
|John is testing whether expensive fertilizer helps his hydrangea plants grow more than cheap fertilizer. What is the dependent variable?
|A new painkiller drug is being tested on humans. What group is the control group?
||The group that is taking placebos.
|A new painkiller drug is being tested on humans. What group is the experimental group?
||The group that is taking the drugs.