Which of the following helps to keep the biological membranes in a fluid state? A. Waxes
B. Cholesterol
C. Phospholipids
D. Water

Which characteristics are typical of a human population in the postindustrial stage?

Stephen is a student who wants to test his knowledge of medical terminology. which option could he use?

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.