Which of the following statements defines the endocrine system? Group of answer choices It is comprised of hormones that regulate physiological functions. It is a part of the diencephalon that relays sensory impulses to the cerebral cortex. It is a part of the diencephalon that activates the autonomic nervous system. It is a network of nerves that connects the mind and the body.

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.