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 4
... degrees of adaptability among individuals , the operation of the rule of the survival of the best adapted , the inheritance by individuals of the traits of the immediate ancestry , and the effects of cli- matic changes , and of ...
... degrees of adaptability among individuals , the operation of the rule of the survival of the best adapted , the inheritance by individuals of the traits of the immediate ancestry , and the effects of cli- matic changes , and of ...
Página 9
... degree to do this is the art of life . It is the ultimate end of science , which finds its final purpose in human conduct . " A law , " according to Darwin , " is the ascertained sequence of events . " The actual sequence of events it ...
... degree to do this is the art of life . It is the ultimate end of science , which finds its final purpose in human conduct . " A law , " according to Darwin , " is the ascertained sequence of events . " The actual sequence of events it ...
Página 18
... degree a response to external conditions . As conditions change , so do forms change to fit their surroundings . A movement over the surface of the earth , any movement in space , brings organisms in contact with barriers . A barrier ...
... degree a response to external conditions . As conditions change , so do forms change to fit their surroundings . A movement over the surface of the earth , any movement in space , brings organisms in contact with barriers . A barrier ...
Página 24
... degree that the stages in its development are unrepresented in our records . The genus is a group of species , an archipelago of islands , and there may be every conceivable degree of width or breadth of channel which seems to separate ...
... degree that the stages in its development are unrepresented in our records . The genus is a group of species , an archipelago of islands , and there may be every conceivable degree of width or breadth of channel which seems to separate ...
Página 50
... degree , what parts of an organism are chiefly affected , whether or no this variation shows a regularity in its occurrence or a determinateness of tendency or direction , whether or no this variation is based on inheritance and if so ...
... degree , what parts of an organism are chiefly affected , whether or no this variation shows a regularity in its occurrence or a determinateness of tendency or direction , whether or no this variation is based on inheritance and if so ...
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