Physical factors such as air, water, sunlight play a vital role in the sustenance of life. Earth cannot survive without these factors. For example, without sunlight, green plants cannot make their own food and release oxygen in the atmosphere which is a basic life form of all living organisms. water is very useful because it indirectly provides us food in the form of fishes etc. The Land is useful as it is providing food and shelter to all the living organisms. So life is not possible without these abiotic factors and hence they help for the sustenance of the habitat.