There are two main points of Darwin's theory
of evolution, which he called the
Theory of Natural Selection:
Natural selection
is differential success
in reproduction. Natural selection occurs through
an interaction between the environment and the
variability inherent among the individual
organisms making up a population.
The product of natural
selection is the adaptation of populations of
organisms to their environment.
These ideas were set out in Darwin's
On the Origin of Species by
Means of Natural Selection (or The
Origin of Species), the text of which
can be found online
here.
http://anthro.palomar.edu/evolve/evolve_2.htm
