The lower the percent of energy required for a machine to perform work, the more energy efficient it is. select the best answer from the choices provided t f

true.

Explanation:

The rational use of energy, also simply called energy efficiency, is to use energy efficiently to achieve a certain result. By definition, energy efficiency consists of the ratio of the amount of energy employed in an activity to that available for its performance. The less energy used in a system, the greater the efficiency of that energy. For this reason, we can say that the lower the percentage of energy required for a machine to do the job, the more energy efficient it is.

the answer is:

carbon dioxide