Which features do the cells of a duck's foot, an alligator's tongue, and a human's eye have in common?

At which location in earth’s interior does the top density continue to increase as thickness decreases?

People with one sickle cell allele are not likely to get malaria. what is this an example of?

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.