A scientist performs an experiment to see if acids have an effect on the health of a particular type of plant. Three sets of plants were treated with various acidic solutions of known pHwhile the control set was treated with a solution 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.