which of the following is the most cleanly burning fossil fuel available, producing the least carbon dioxide per unit of energy released?

What does the process of natural selection involve

What layer of the atmosphere is directly above the troposphere?

Temperature is defined as a. the equivalent of heat. b. a measure of the average kinetic energy of the individual atoms or molecules composing a substance. c. how hot or cold it is. d. the total kinetic energy of the atoms or molecules composing a substance. e. none of the above is correct.