what are the key elements that lead to so much variation in the physical and chemical condition of different habitat?
The most important ones are temperature, water, light and soil. We must remember that the physio-chemical (abiotic) components alone do not characterize the habitat of an organism completely; the habitat includes biotic components also ? pathogens, parasites, predators and competitors ? of the organism with which they interacts constantly. We assume that over a period of time, the organism had through natural selection, evolved adaptations to optimize its survival and reproduction in its habitat