Hurry 30 points
(a) a long molecule made of a chain of individual molecules. (b) the individual molecules of the chain. (c) each individual molecule consists of a central carbon attached to an amino group (-nh2), a carboxyl group (-cooh), a hydrogen (h), and an r group. (d) the r group of the individual molecule.
which part of the diagram illustrates a protein?
a
b
d
c

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.