increase in numbers slowly, and endure for unequal periods of time; for the process of modification is necessarily slow, and depends on many complex contingencies. The dominant species
belonging to large and belonging to large and 1869 1872 |
of the larger 1859 1860 1861 1866 |
dominant groups tend to leave many modified descendants,
which form which form 1869 1872 | and thus 1859 1860 1861 1866 |
new sub-groups and
groups. groups. 1869 1872 | groups 1859 1860 1861 1866 |
....... 1869 1872 | are 1859 1860 1861 1866 |
....... 1869 1872 | formed. 1859 1860 1861 1866 |
As these are formed, the species of the less vigorous groups, from their inferiority inherited from a common progenitor, tend to become extinct together, and to leave no modified offspring on the face of the earth. But the utter extinction of a whole group of species
has sometimes been a has sometimes been a 1866 1869 1872 |
may often be a very 1859 1860 1861 |
slow process, from the survival of a few descendants, lingering in protected and isolated situations. When a group has once wholly disappeared, it does not reappear; for the link of generation has been broken. |
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We can understand how the
...OMIT 1869 |
spreading of the 1859 1860 1861 1866 |
dominant forms
which spread widely and yield the greatest number of varieties will which spread widely and yield the greatest number of varieties will 1869 |
of life, which are those that oftenest vary, will in the long run 1859 1860 1861 1866 |
tend to people the world with allied, but modified, descendants; and these will generally succeed in
displacing displacing 1869 | taking 1859 1860 1861 1866 |
the
groups groups 1869 |
places of those groups of species 1859 1860 1861 1866 |
which are their inferiors in the struggle for existence. Hence, after long intervals of time, the productions of the world
....... 1869 | will 1859 1860 1861 1866 |
appear to have changed
simultaneously. simultaneously. 1859 1861 1866 1869 | simultaneously. & 1860 |
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We can understand how it is that
all the forms of life, ancient and recent, make together a few grand classes; for all are at least thus far connected by generation. all the forms of life, ancient and recent, make together a few grand classes; for all are at least thus far connected by generation. 1869 |
all the forms of life, ancient and recent, make together one grand system; for all are connected by generation. 1859 1860 1861 1866 |
dominant forms which spread widely and yield the greatest number of varieties tend to people the world with allied, but modified, descendants; and these will generally succeed in displacing the groups which are their inferiors in the struggle for existence. 1872 |
↑1 blocks not present in 1859 1860 1861 1866 1869; present in 1872 | Hence, after long intervals of time, the productions of the world will appear to have changed simultaneously.
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We can
understand, understand, 1859 1860 1861 1866 1869 | understand 1872 |
from from 1859 1860 1861 1866 1869 |
how it is that all the forms of life, ancient and recent, make together a few grand classes. We can understand, from 1872 |
the continued tendency to divergence of character, why the more ancient a form is, the more it generally differs from those now
living; living; 1869 1872 |
living. 1859 1860 1861 |
living; why ancient and extinct forms often tend to fill up gaps between existing forms, sometimes blending two groups previously classed as distinct into one; but more commonly only bringing them a little closer together. 1866 |
why why 1869 1872 | Why 1859 1860 1861 |
ancient and extinct forms often tend to fill up gaps between existing forms, sometimes blending two
groups, groups, 1869 1872 | groups 1859 1860 1861 |
previously previously 1859 1860 1869 1872 | previ- ously 1861 |
classed as
distinct, distinct, 1869 1872 | distinct 1859 1860 1861 |
into one; but more commonly
bringing them only bringing them only 1869 1872 |
only bringing them 1859 1860 1861 |
a little closer together. The more ancient a form is, the more
often often 1869 1872 | often, 1859 1860 1861 1866 |
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