Evolution and animal life, an elementary discussion of facts, processes, laws and theories relating to the life and evolution of animalsD. Appleton, 1908 - 489 páginas |
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Página ix
... young , 225 ; Em- bryonic and post - embryonic development , 227 ; Developmental stages , 229 ; Continuity of development , 231 ; Metamorphosis or apparent discontinuity , 234 ; Significance of facts of develop- ment , 234 ; Divergence ...
... young , 225 ; Em- bryonic and post - embryonic development , 227 ; Developmental stages , 229 ; Continuity of development , 231 ; Metamorphosis or apparent discontinuity , 234 ; Significance of facts of develop- ment , 234 ; Divergence ...
Página 53
... young to parent . Some biologists seem to mean by heredity a force or dominat- ing influence which brings about this likeness ; while others use the word heredity to name rather the processes which are gone through with by the young in ...
... young to parent . Some biologists seem to mean by heredity a force or dominat- ing influence which brings about this likeness ; while others use the word heredity to name rather the processes which are gone through with by the young in ...
Página 60
... young in the interval and surviving to be a hundred years old . If this be so , after about 800 years there should be 19,000,000 elephants alive descended from the first pair . " A few years of still further multiplication without check ...
... young in the interval and surviving to be a hundred years old . If this be so , after about 800 years there should be 19,000,000 elephants alive descended from the first pair . " A few years of still further multiplication without check ...
Página 61
... young . But in self protection and in propagation of the species very few individuals succeed in comparison with the vast number which the process of reproduction calls into being . The destruction in nature is not indiscriminate . In ...
... young . But in self protection and in propagation of the species very few individuals succeed in comparison with the vast number which the process of reproduction calls into being . The destruction in nature is not indiscriminate . In ...
Página 62
... young sharing in part , at least , their own advantages , and with renewed selec- tion the degree of adaptation increases with successive genera- tions . To the process of natural selection we must , in most cases , probably ascribe the ...
... young sharing in part , at least , their own advantages , and with renewed selec- tion the degree of adaptation increases with successive genera- tions . To the process of natural selection we must , in most cases , probably ascribe the ...
Outras edições - Ver tudo
Evolution and Animal Life: An Elementary Discussion of Facts, Processes ... David Starr Jordan,Vernon Lyman Kellogg Visualização integral - 1907 |
Evolution and Animal Life: An Elementary Discussion of Facts, Processes ... David Starr Jordan,Vernon Lyman Kellogg Visualização integral - 1907 |
Evolution and animal life, an elementary discussion of facts, processes ... David Starr Jordan,Vernon Lyman Kellogg Visualização integral - 1907 |
Palavras e frases frequentes
actual adaptation adult animals animals and plants ants apes appear artificial selection bees beetles biologists birds body breeding butterfly called causes centrosome changes CHAPTER characters chromatin chromosomes color and pattern common crab Darwin degeneration degree descent differentiation division egg cell embryo environment existence fact factors fauna female fertilized fishes forms fossils genus germ cells habit hatched heredity honeybee host hybrid individuals influence inheritance insects instinct islands isolation kinds of animals known larva larvæ live lower male mammals matter ment modified mutations natural selection naturalists nest nucleus offspring organic evolution origin Origin of Species parasites parent phenomena plasm primitive produced protoplasm Protozoa race relation reproduction reptiles resemblance Sacculina sea anemone sexual sexual selection sheep species species-forming sperm spines stage structure substance tail theory tion traits tree variation various vertebrates Weismann wings workers young