Which of the following describes the process of deflation? a. oxygen levels in the air are decreased due to pollution. b. hurricanes destroy natural wind barriers. c. the surfaces of mountains are stripped of trees. d. the wind removes surface particles, resulting in lower land surface.

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.