How does the carbon locked in shells of marine organisms move back to the atmosphere? a. through subduction of deposits and volcanism b. through the process of respiration in these organisms c. through death and decomposition d. through the microbial process of ammonification e. through chemical reactions in acidifying oceans

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.