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Now a third category of problems
inevitable, if we accept natural selection of useful modifications
the only factor of organic evolution. About this category difficulties
already been said in 166 "Foundations of biology"; and I doubt whether I
better to state them than I did in the aforementioned place. So I
I hope that readers will forgive the repetition:
"Where life is relatively simple, or where surrounding conditions make
especially important is any one shipment, there the experience the most
fitted can easily produce a particular change in the body and without
any part of the transmission of functionally acquired modifications. But
as life becomes more complicated as for a safe
the existence of the required cash high development one
abilities and cash many abilities in the same way arise
obstacles for the exclusive development of any one ability "by
the preservation of favoured races in the struggle for existence". Since
multiplied ability, in so far as there is opportunity for different
individuals of a species to have various kinds of superiorities over one another Alone
subsist more speed runs, others more
sharp vision, others more subtle sense of smell, the fourth - thinner
hearing, the fifth - most power, the sixth - extraordinary strength to endure hunger and
thirst, seventh - special trick, the eighth - extreme timidity, the ninth -
very bold, others by other bodily and spiritual properties.
Currently, there is no doubt that under otherwise identical
the conditions of each of these properties, giving an extra chance to provide life
should be passed on to offspring. But still, apparently, cannot be said to
that one any of these properties for the next generations must
be strengthened by natural selection. In order to make it stronger
it is necessary that individuals that possess no more than average strength
this ability, often exposed to death than those individuals who
gifted with this ability to a high degree.
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