Problems with overcrowing or overpopulation?

Question

explain why..

Answer 1

sources become scarce (living space, natural resources, etc), also can result in pollution and higher crime rate

Answer 2

People not not understanding the importance of safe s*x and marriage....think about it

Answer 3

The problem with overcrowing is that one may be too loud for the neighbors OR one could come down with a serious sore throat.  Either way, the risk of alienating or annoying someone else with this behavior increases DRAMATICALLY as the population grows.