The heterotrophic hypothesisis the
and most accepted hypothesis
the origin of life.

spontaneous generation hypothesis
has excluded by the experiments
Pasteur. The panspermia hypothesis
not yet completely refuted it is
not well-accepted it would be
necessary explain how living beings
survive long space journeys
conditions of extreme temperatures
well as to clarify manner by which
they resist the high temperatures
when entering the earth's
. The autotrophic hypothesis
is if one takes into
that the production of material
from inorganic substances a highly
complex process diversified
enzymatic systems and the
existence of complex
reactions on the primitive were
not probable.