It
is interesting to contemplate an entangled bank, clothed
with many plants of many kinds, with birds singing on the
bushes,
with various insects flitting about, and with worms crawling
through the damp earth, and to reflect that these elaborately
constructed forms, so different from each other, and
dependent
on each other in so complex a manner, have all been produced
by laws acting around us. These laws, taken in the largest
sense, being Growth with Reproduction; inheritance which is
almost implied by reproduction; Variability from the indirect
and direct action of the external conditions of life, and from
use and disuse; a Ratio of Increase so high as to lead to a
Struggle for Life, and as a consequence to Natural Selection,
entailing Divergence of Character and the Extinction of less-improved
forms. Thus, from the war of nature, from famine and death,
the most exalted object which we are capable of conceiving,
namely, the production of the higher animals, directly follows.
There is grandeur in this view of life, with its several powers,
having been originally breathed into a few forms or into one;
and that, whilst this planet has gone cycling on according
to the fixed law of gravity, from so simple a beginning endless
forms most beautiful and most wonderful have been, and are
being, evolved. - An Entangled Bank. From the conclusion of Darwin's
Origin of Species