
The SciencesSeptember 1, 1983
The Biosphere
The totality of microbial, animal and plant lik on the earth not only is sustained by the lithosphere, the hydrosphere and the atmosphere but also has powerfully shaped their evolution

The Biosphere
The totality of microbial, animal and plant lik on the earth not only is sustained by the lithosphere, the hydrosphere and the atmosphere but also has powerfully shaped their evolution

The Oxygen Cycle
The oxygen in the atmosphere was originally put there by plants. Hence the early plants made possible the evolution of the higher plants and animals that require free oxygen for their metabolism