If the answer is true, completely shade in the letter A on your answer sheet. If the answer is false, completely shade in the letter B on your answer sheet. True False A B 61. The Best First principle implies that humans use deposits of natural resources that require the least amount of effort to extract last. Isotopes are elements with different atomic masses due to different neutrons.
Oil is found only in sedentary rock.
The surface layer of oceanic water is more dense, which is why there is a rapid decrease in temperature in the thermocline layer compared to the surface layer. Albedo is reduced by increased cloud cover. Plants store energy as fat. A negative feedback loop reinforces an action in a system. Efficiency is the ability to do work.