Question

summarize it! drag and drop the words or phrases that accurately complete the paragraph. a(n) is a type of investigation. in it, changed to see what happens. making sure that the results of the experiment are due to the change to the variable is important. scientists need to know what happens if no change was made. this is called the group. the group, the group where only one variable is changed, is then compared to the control group. three variables are one variable is dependent experiment control experimental model survey

Explanation:

In scientific investigations, an experiment changes one variable to observe results. The group with no change is the control group, and the group with the single - variable change is the experimental group.

Answer:

A(n) experiment; one variable is; control; experimental