The Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifePenguin Books, 1982 - 477페이지 |
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229 페이지
... perfect as , or slightly more perfect than , the other inhabitants of the same country with which it has to struggle for existence . And we see that this is the degree of perfection attained under nature . The endemic productions of New ...
... perfect as , or slightly more perfect than , the other inhabitants of the same country with which it has to struggle for existence . And we see that this is the degree of perfection attained under nature . The endemic productions of New ...
230 페이지
... perfect . Can we consider the sting of the wasp or of the bee as perfect , which , when used against many attacking animals , can- not be withdrawn , owing to the backward serratures , and so inevitably causes the death of the insect by ...
... perfect . Can we consider the sting of the wasp or of the bee as perfect , which , when used against many attacking animals , can- not be withdrawn , owing to the backward serratures , and so inevitably causes the death of the insect by ...
289 페이지
... perfect , seems to depend on several circumstances ; in some cases largely on the early death of the embryo . The sterility of hybrids , which have their reproductive systems imperfect , and which have had this system and their whole ...
... perfect , seems to depend on several circumstances ; in some cases largely on the early death of the embryo . The sterility of hybrids , which have their reproductive systems imperfect , and which have had this system and their whole ...
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accumulated adapted affinities allied species America ancient animals appear become bees believe birds breeds cause cells chapter characters cirripedes climate closely allied colour continuous crossed crustaceans Darwin degree developed difficulty distinct species domestic doubt eggs embryo Europe existence exterminated extinct extremely facts favourable fertility flowers formation forms fossil genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate larvae less living male mammals manner Marsupials migration modification modified descendants natural selection naturalists nearly nest offspring organisation organs Origin Origin of Species palaeozoic perfect pigeons pistil plants pollen present principle probably produced progenitor quadrupeds ranked remarked reproductive resemblance rudimentary seeds seems sexual selection Silurian slight South America sterility structure struggle successive supposed tend theory tion trees variability variations varieties vary whole widely wings