Biotics factors in environments

Environments around us (humans) and others, they provide homes, foods, and also resources that we can reliey continously.
Organisms can interact by develop or in other words grow, they can probably reproduce or excrete wastes.
First comes the organism, after that the population, communities and last but not the least ecosystem.
First of all, I think there are several reasons why all the animal can bunch up together, the important thing of all, are the animals reliey on climate or the weather. Not all the animals live in same climate within they search for different food. They do not like when their appetite changes, it can also depend on their skin, if their dry; they wouldn't want to live somewhere where your skins will burst(could be) or feel uncomfortable.
Well I didn't actually see animals hibernating but they first need to gather nutritions to eat during the winter since they would'nt hunt or find other resources. Some types of animals contribute to stack foods.

http://www.youtube.com/watch?v=uraqkShpqsI Living things rock! Because, its us...

I hope that biotic factors stay sustain and alive, since we are one of the biotic factors, although it will be strange to take out one of them I am still supporting the biotic instead of nonliving abiotic.
We can pretty much sustain our lives since we can eat organisms (those we eat). But we should consider which one will be the best.