Which of the following statements is true about biomes?
geographic location is not one of the three main ways biomes are classified. geographic location has nothing to do with classification of biomes. geographic location is random; there can be many biomes in one region of the world.
geographic location is generally quite important as it affects the climate and what types of organisms live in a biome.

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.