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it 1859 1860 1861 1866 1869
we have reason to believe that it 1872

through natural selection, of such differences, when beneficial to the individual, that 1859 1860 1861 1866
through natural selection, of beneficial differences that has 1869
of beneficial differences which has 1872

the more important 1859 1860 1861 1866 1872
those 1869

by which the innumerable beings on the face of this earth are enabled to struggle with each other, and the best adapted to survive. 1859 1860 1861 1866
which are the most important for the welfare of each species. 1869
in relation to the habits of each species. 1872

such modifications will add to the beautiful and harmonious diversity of nature.
Whatever the cause may be of each slight difference
between
in
the offspring
and
from
their
parents —
parents—
and a cause for each must
exist —
exist—
it is the steady
accumulation
accumulation,
through natural selection, of such differences, when beneficial to the individual, that
given
gives
rise to all the more important modifications of
structure
structure,
by which the innumerable beings on the face of this earth are enabled to struggle with each other, and the best adapted to survive.