All organisms require certain nutrients for survival and reproduction. suppose a particular bacterial population thrives only in the top five millimeters of lakes. suppose a microscopic plant population also thrives only in the top five millimeters of lakes. when the bacterial and plant populations are floating together, the bacterial population is reduced to 20% of the number it was when floating in the absence of plants. what does this situation likely illustrate?

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.