have a test need help!!! A group of student scientists wanted to find out about the water in the drinking fountains at school. They wanted to answer this question: What is the quality of the water in the drinking fountains? The students measured the mineral content, the pH, the density and the clarity of the water.


Which of the following best explains the scientists' plans?



The scientists are making observations.



The scientists are conducting an investigation.



The scientists are conducting a controlled experiment.



The scientists are conducting both an investigation and a controlled experiment.