Question
What are the key differences that make such a great variation in the physical and chemical conditions of different habitats?

Answer

Different abiotic factors make great variations in the physical and chemical conditions of different habitats.
The most important abiotic factors are temperature, water, light and soil. These abiotic factors act with the resident biotic factors in that habitat. Biotic components such as pathogens, parasites, predators and competitors keep on interacting continuously. All such interactions cause variations in different habitats.

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