Which of the following represents a metabolic pathway? a. four boxes in a row with arrows between them b. one box on top with arrows pointing to three boxes below c. three boxes on top with arrows pointing to one box below d. one box with arrows pointing to two boxes above and two boxes below

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.