Question

the bubbles evaporates. edna knew that when liquids are warmer, they evaporate faster. so, she wondered if she could make her bubbles last longer by cooling the bubble solution. edna cooled six bottles of bubble solution to 30°f below room temperature. she left another six bottles of bubble solution at room temperature. then, she measured how long bubbles made from the solution in each bottle lasted. in this experiment, which were part of a control group? the bottles that were at room temperature the bottles that were cooled down

Explanation:

A control group in an experiment is the group that is not exposed to the experimental variable (here, cooling the solution) and serves as a baseline for comparison. The room temperature bottles are not modified with the cooling variable, so they are the control group.

Answer:

the bottles that were at room temperature