다음 빈칸에 들어갈 말로 가장 적절한 것을 고르시오.
The skeletons found in early farming villages in the Fertile Crescent are usually shorter than those of neighboring foragers, which suggests that their diets were less varied. Though farmers could produce more food, they were also more likely to starve, because, unlike foragers, they relied on a small number of crops, and if those crops failed, they were in serious trouble. The bones of early farmers show evidence of vitamin deficiencies, probably caused by regular periods of starvation between harvests. They also show signs of stress, associated, perhaps, with the intensive labor required for plowing, harvesting crops, felling trees, maintaining buildings and fences, and grinding grains. Villages also produced refuse, which attracted vermin, and their populations were large enough to spread diseases that could not have survived in smaller, more nomadic foraging communities. All this evidence of ____________________ suggests that the first farmers were pushed into the complex and increasingly interconnected farming lifeway rather than pulled by its advantages.
**refuse: 쓰레기 ***vermin: 해충