Neurons, act as the communicators of the nervous system. Neurons receive information, integrate it, and pass it along. They communicate with one another, with cells in the sensory organs, and with muscles and glands.
Information was taken from: http://www.sparknotes.com/psychology/psych101/thebrain/section2/
In case you would like to do further reading.
They would most likely overpopulate. That sounds like a good thing, but if that happens they would exhaust their food supply way to quickly and they would starve to death. This is why they need a predator, to balance the ecosystem
The air types can effect the weather,like cold air with huge breezes can make hail!
''To make informed decisions''
Hope it helps :)
