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OMIT 1861 1866 1869 1872
more living beings can be supported on the same area 1859 1860

by so much a greater number can be supported on the same area,— of 1861 1866
of 1859 1860
by so much can a greater number be supported on the same area,— of 1869
by so much the more can a large number be supported on the same area,— of 1872

or to naturalised productions. 1860 1861 1866 1869
or at naturalised productions. 1859
and to the productions naturalised in foreign lands. 1872

within each class, which 1861 1866 1869 1872
which 1859 1860

and the generally well-defined distinctions of the innumerable 1861 1866 1869
of all 1859 1860
and the generally well-defined distinctions between the innumerable 1872

in each class throughout the world, may 1861 1866 1869 1872
may 1859 1860

character; for OMIT the more
they
organic beings
diverge in structure, habits, and constitution, by so much a greater number can be supported on the same area,— of which we see proof by looking
at
to
the inhabitants of any small
spot,
spot
or to naturalised productions.
Therefore
Therefore,
during the modification of the descendants of any one species, and during the incessant struggle of all species to increase in numbers, the more diversified
the
these
descendants become, the better will be their chance of
success
succeeding
in the battle
of
for
life. Thus the small differences distinguishing varieties of the same species,
will
....
steadily tend to
increase,
increase
till they
come to
come to
equal the greater differences between species of the same genus, or even of distinct genera.
We have seen that it is the common, the
widely diffused,
widely-diffused,
and
widely ranging
widely-ranging
species, belonging to the larger
genera,
genera
within each class, which vary most; and these
will
....
tend to transmit to their modified offspring that superiority which now makes them dominant in their own countries. Natural selection, as has just been remarked, leads to divergence of character and to much extinction of the less improved and intermediate forms of life. On these principles,
I believe,
....
the nature of the
affinities
affinities,
and the generally well-defined distinctions of the innumerable organic beings in each class throughout the world, may be explained. It is a truly wonderful fact— the wonder of which we are apt to overlook from familiarity— that all animals and all plants throughout all time and space should be related to each other in
natural groups
groups
group
subordinate to
groups,
group,
in the manner which we everywhere behold— namely, varieties of the same species most closely
related,
related
together,
together,
species of the same genus less closely and unequally
related,
related
together,
together,
forming sections and sub-genera, species of distinct genera much less closely related, and genera related