Imagine that you're moving to a new home in arizona, near the area shown in this photo. your new area has a warm climate. it's also very dry, and it receives little rainfall. animals have learned how to survive without many sources of water, and plants have learned to adapt to intense summers with high 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.