It took hundreds of millions of years to produce the life that now inhabits the earth—eons
of time in which that developing and evolving and diversifying life reached a state of adjustment
and balance with its surroundings. The environment, rigorously shaping and directing the life it
supported, contained elements that were hostile as well as supporting. Certain rocks gave out
dangerous radiation, even within the light of the sun, from which all life draws its energy, there
were short-wave ...
Folksonomies:
Folksonomies: