The Origin of Species by Means of Natural Selection, Or, The Preservation of Favored Races in the Struggle for Life: Reprinted from the Sixth London EditionBurt, 1890 - 538ÆäÀÌÁö |
µµ¼ º»¹®¿¡¼
66°³ÀÇ °á°ú Áß 1 - 3°³
44 ÆäÀÌÁö
... considered as varieties , but which have all been ranked by botanists as species ; and in making this list he has omitted many trifling varieties , but which never- theless have been ranked by some botanists as species , and he has ...
... considered as varieties , but which have all been ranked by botanists as species ; and in making this list he has omitted many trifling varieties , but which never- theless have been ranked by some botanists as species , and he has ...
284 ÆäÀÌÁö
... considering all the ascertained facts on the inter- crossing of plants and animals , it may be concluded that some degree ... considered as absolutely universal . LAWS GOVERNING THE STERILITY OF FIRST CROSSES AND OF HYBRIDS . We will now ...
... considering all the ascertained facts on the inter- crossing of plants and animals , it may be concluded that some degree ... considered as absolutely universal . LAWS GOVERNING THE STERILITY OF FIRST CROSSES AND OF HYBRIDS . We will now ...
459 ÆäÀÌÁö
... considered as lower in the scale than the larva , as with certain parasitic crustaceans . To refer once again to cirri- pedes : the larv©¡ in the first stage have three pairs of loco- motive organs , a simple single eye , and a ...
... considered as lower in the scale than the larva , as with certain parasitic crustaceans . To refer once again to cirri- pedes : the larv©¡ in the first stage have three pairs of loco- motive organs , a simple single eye , and a ...
±âŸ ÃâÆǺ» - ¸ðµÎ º¸±â
ÀÚÁÖ ³ª¿À´Â ´Ü¾î ¹× ±¸¹®
adapted admit affinities allied species America ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied color continued crossed crustaceans degree developed difficulty distinct species domestic doubt effects eggs embryo existing extinct extremely facts favorable females fertility flowers formation forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate intervals kind lamell©¡ larv©¡ less living male mammals manner marsupials migration modified descendants natural selection naturalists nearly nest oceanic islands offspring organs parent peculiar perfect pigeons pistil pollen present principle probably produced quadrupeds ranked remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive suppose tend theory tion trees variability variations varieties vary whole widely different wings young