On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeD. Appleton, 1909 - 430페이지 |
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7 페이지
... - Nature of the checks to increase - Com- petition universal - Effects of Climate - Protection from the number of individuals - Complex relations of all animals and 7 61 plants throughout nature - Struggle for life most severe between.
... - Nature of the checks to increase - Com- petition universal - Effects of Climate - Protection from the number of individuals - Complex relations of all animals and 7 61 plants throughout nature - Struggle for life most severe between.
10 페이지
... climate and of the level of the land , and by occasional means - Dispersal during the Glacial period co - extensive with the world .. 300 CHAPTER XII GEOGRAPHICAL DISTRIBUTION - continued Distribution of fresh - water productions - On ...
... climate and of the level of the land , and by occasional means - Dispersal during the Glacial period co - extensive with the world .. 300 CHAPTER XII GEOGRAPHICAL DISTRIBUTION - continued Distribution of fresh - water productions - On ...
14 페이지
... which justly excites our admiration . Naturalists continually refer to external conditions , such as climate , food , & c . , as the only possible cause of variation . In one very limited sense , as we 14 INTRODUCTION.
... which justly excites our admiration . Naturalists continually refer to external conditions , such as climate , food , & c . , as the only possible cause of variation . In one very limited sense , as we 14 INTRODUCTION.
19 페이지
... climates and treatment , I think we are driven to conclude that this great variability is simply due to our domestic productions having been raised under con- ditions of life not so uniform as , and somewhat different from , those to ...
... climates and treatment , I think we are driven to conclude that this great variability is simply due to our domestic productions having been raised under con- ditions of life not so uniform as , and somewhat different from , those to ...
22 페이지
... climate . ( Habit also has a decided influence , as in the period of flowering with plants when transported from one climate to another . In animals it has a more marked effect ; for instance , I find in the domestic duck that the bones ...
... climate . ( Habit also has a decided influence , as in the period of flowering with plants when transported from one climate to another . In animals it has a more marked effect ; for instance , I find in the domestic duck that the bones ...
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accumulated adapted affinities allied species America analogous ancient animals appear archipelago become bees believe birds breeds cause cells characters cirripedes climate closely allied colour continuous crossed crustaceans degree difficulty distinct species divergence domestic doubt embryo endemic existing exterminated extinct extremely facts favourable fertilised fertility flowers formations forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important increase individuals inhabitants inherited insects instance instincts intercrossing intermediate larvæ laws less living males mammals manner migration modification modified descendants natural selection naturalists nearly nest occasionally offspring organic organisation origin of species perfect pigeons plants pollen present principle probably produced progenitor ranked reciprocal crosses remarked resemble rock-pigeon rudimentary seeds sexual sexual selection Silurian slight sometimes South America sterility structure struggle successive supposed swimbladder tend theory variability variations varieties vary whole widely