Partial Occupation of a Planet

Lovelock quote from "The Ages Of Gaia:

"There can be no partial occupation of a planet
by living organisms. It would be as impermanent
as half an animal. The presence of sufficient living
organisms on a planet is needed for the regulation
of the environment. Where there is incomplete occupation
the ineluctable forces of physical and chemical evolution
would soon render it unihabitable."

IF that is true, and I think it is, that suggests some possible
clues for the origin:
1. It probably happened very quickly such that life took over
the planet reasonably fast though fast may stil be millions of
years long.
2. It is more likely that an all world force of energy was
the power behind life - that forced chemicals into the reaction
we define as life. Thus it would support the sun/heat cycle
over a specific heat vent or lightning strike etc. The sun is not
a local force but a world force.

Comment?

.

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