How did the raccoon population become such a big problem in Japan?
People have continued to breed them,
They have no natural predators,
The Japanese do not believe in killing them.
The bears that used to eat them are extinct.

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.