Which sentence is a run-on? Sarah felt drowsy in school today she had trouble sleeping last night.
Although it chews up his belongings and barks a lot, Adam loves his new puppy.
The house needed to be cleaned before our guests arrived that afternoon.
We decided not to go to the beach yesterday because it looked like it was going to rain.

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.