Leyda returns home from competing in a community half-marathon and gets on the scale. She finds she has lost 2 lb since she weighed herself that morning.

Part A How much fluid should she consume over the next few hours in order to fully rehydrate? ( Recall that the goal of rehydration is to consume 1.5 times more fluid than is lost.)

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.