| 1 résultat  | books.google.fr The central claim of that book can be fairly simply stated. According to the
Darwinian theory, any natural group of similar species — all the mammal species
, for instance — owe their common mammalian characteristics to a common
descent from a single ancestral mammal species. The differences among the
various mammalian species are due to natural selection, which has brought
about gradual changes in the many irregularly branched lines of descent
diverging from that common ... |
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