Amarine biologist measured the amount of heat radiated from an aquarium over the course of an experiment. he concludes that the aquarium cannot be considered an isolated system. what could he do to make the aquarium an isolated system?

a. he could add a heating element to the aquarium to compensate for heat lost through radiation.
b. he could add insulation to the aquarium so that it does not exchange energy with its surroundings.
c. he could add light to the aquarium so that the system's total energy change remains the same.
d. he could add living organisms to the aquarium so that natural heat is generated by the system.