The Arctic Fox has a gene that regulates fur color. In warm summers, the gene for brown fur color is activated. In cold winters, the brown fur gene is deactivated and the white fur gene is activated. Which of the following best describes this situation?

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.