Question

the passage below describes an experiment. ted 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. ted poured the same amount of milk into each of three pots. he added 1/2 cup of vinegar to one pot, 1/4 cup of vinegar to another pot, and nothing to the final pot. ted 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 1/4 cup of vinegar added to milk were part of a control group an experimental group

Explanation:

In an experiment, the control group is left unchanged while experimental groups have variables manipulated. Here, the pot with ¼ cup of vinegar added has a variable (vinegar amount) being tested, so it's part of the experimental group.

Answer:

an experimental group