Why is the exosphere hotter than the troposphere? A. The exosphere is closer to earth's surface b. The troposphere loses its heat to the outer layers of earth's atmosphere c. The exosphere absorbs high-frequency, high-energy EMS waves d. The troposphere heats up the exosphere, causing it to have higher temperatures

Which of the following best describes the expensive tissue hypothesis? brains require more energy, so the gut had to be reduced, and larger brains and tool use led to higher quality diets. increasing body size means that homo neanderthalensis had to include more fat in its diet. brains require more energy, so the gut had to be reduced as brains got bigger. brains require more fat, so the gastrointestinal viscera (gut) had to expand, and hands were needed to acquire more food.