Glucose is a form of sugar found in the blood. cells use glucose as a source of energy, but too much or too little can cause serious health issues. so, the body uses the hormone insulin to regulate glucose in the blood. insulin maintain glucose levels in the blood. if blood glucose levels got very high, what would you expect to see happen to insulin levels? insulin levels would decrease. insulin levels would increase. insulin levels would not change.

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.