what are the key elements that lead to so much variation in the physical and chemical condition of different habitat?

The key elements are -
1. Temperature
2. Soil
3. Water
4. Sunlight
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Biotic factors also
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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
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