Question

drag and drop the words or phrases that accurately complete the paragraph. scientists investigate the world around them. one type of investigation is where scientists change . a variable is something that can be controlled or changed in an experiment. to see if the change to the variable made a difference, scientists need to know what would normally happen. this is called the . the experimental group is compared to the control group. control group experimental group an experiment a model only one variable three variables

Explanation:

In scientific investigations, an experiment is a type of investigation where scientists change only one variable to isolate its effect. The control group is used for comparison to see what would normally happen without the variable change.

Answer:

an experiment, only one variable, control group