Life and the Biosphere

The nature of life is determined by the surroundings in which the life forms must exist. Much of the environment in which organisms live is described by physical factors, including whether or not the surroundings are primarily aquatic or terrestrial. For a terrestrial environment, important physical factors are the nature of accessible soil and availability of water and nutrients. These are abiotic factors. There are also important biotic factors relating to the life forms present, their wastes and decomposition products, their availability as food sources, and their tendencies to be predatory or parasitic. 

1 Biosphere in Stabieizing the Earth System Gaia Hypothesis 

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It is self-evident that the universe was pregnant with life and the biosphere with man. Otherwise, we would not be here. Or else, our presence can be explained only by a miracle... 

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