7. What purpose did the incubator serve in this experiment? What changes could you make to this experiment to find the optimal temperature for the bacteria converting the milk into yogurt?

to provide optimum temperature..

Explanation:

The main purpose of the incubator in this experiment is to provide favorable temperature to the microorganisms. Incubator is a device which is used for rearing the useful microbes such as bacteria and fungi etc. This incubator provides a close environment where temperature of the environment is constant. These useful microbes are very sensitive to external temperature so incubator is used as a growing medium. In this experiment, milk is kept in incubator in order to convert into yogurt by the action of beneficial bacteria. Change the temperature of the incubator in order to find the optimal temperature for the bacteria converting the milk into yogurt.

its temperature is increasing. this causes molecular vibrations to increase.