Origin of Species Variorum

→ 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

Whatever the cause may be of each slight difference

between

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.