Justin is planning his science fair project. he wants to measure how oxygen levels affect the rate of photosynthesis in plants. is this an example of a scientific investigation or an experiment?
group of answer choices
an experiment because it tests a cause and effect relationship
an experiment because it does not ask a testable question
an investigation because it uses only observations
an investigation because there is a control group
Answers: 2
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Justin is planning his science fair project. he wants to measure how oxygen levels affect the rate o...
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