Actually, it's probably a mixture of things, not just heat. Heat is probably just one of the many important pieces. From what I know about biology/evolution, t

Actually, it's probably a mixture of things, not just heat. Heat is probably just one of the many important pieces. From what I know about biology/evolution, this answer is just as likely to have a single clean reason as it is that you killed the one and only cockroach living in your apartment.