Question

perry wanted to make cheese from milk curds. he knew that milk forms curds when it is heated, and he heard that adding vinegar could help. he wanted to know whether adding different amounts of vinegar would affect the size of the curds.
perry poured the same amount of milk into each of three pots. he added ½ cup of vinegar to one pot, ¼ cup of vinegar to another pot, and nothing to the final pot. perry heated each pot for 20 minutes. then, he observed how large the curds were in each pot. he repeated this process three times.
complete the sentence.
in this experiment, the pots with ½ cup of vinegar added to milk were part of ______
options: a control group, an experimental group

Explanation:

In an experiment, the experimental group is the one where the independent variable (here, the amount of vinegar) is manipulated. The pot with ½ cup of vinegar has the independent variable changed (vinegar added), while the control group (pot with no vinegar) is used for comparison. So this pot is part of the experimental group.

Answer:

an experimental group