The Neolithic people developed farming and domestic animals. So domesticating animals and agriculture. Or say farming for agriculture.
Answer: There is pollution in the east river
Explanation: If we think about it cant be a lack of food as it talks about having a large food source. Nor can it be climate change as that would result in a low yellow Perch population. it cant be they aren't able to catch the bird. So the only logical answer is a pollution that the birds are adapted to.
Your answer is A. Republic.
Hope this helps :)
Answer: Hoboes- was the name of person who were homeless and traveled along rail lines hopping on trains.