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 36
... characters animals like the 02 . m.f. FIG . 25. - Longitudinal section through the body of a sea anemone : oe . , œsophagus ; m.f. , mesen- terial filaments ; r . , reproductive organs . FIG . 26. One of the sim- plest sponges ...
... characters animals like the 02 . m.f. FIG . 25. - Longitudinal section through the body of a sea anemone : oe . , œsophagus ; m.f. , mesen- terial filaments ; r . , reproductive organs . FIG . 26. One of the sim- plest sponges ...
Página 51
... character which distinguish the sexes in many species of animals . Let one recall these characters in the pea fowl , the bird of paradise , the pheasant , some of the butterflies , the lamellicorn beetles , many fishes , and so on ...
... character which distinguish the sexes in many species of animals . Let one recall these characters in the pea fowl , the bird of paradise , the pheasant , some of the butterflies , the lamellicorn beetles , many fishes , and so on ...
Página 54
... characters of either one alone , or , indeed , characters of wholly new type . The important thing is , however , that there is no certainty - indeed there is almost certainty of the opposite - that any particular variation will be ...
... characters of either one alone , or , indeed , characters of wholly new type . The important thing is , however , that there is no certainty - indeed there is almost certainty of the opposite - that any particular variation will be ...
Página 55
... and other func- tional stimulation , in a word that all body change and adapta- tion , all characters acquired during the lifetime of an individual , 1 can be , in some degree at least , handed FACTORS AND MECHANISM OF EVOLUTION 55.
... and other func- tional stimulation , in a word that all body change and adapta- tion , all characters acquired during the lifetime of an individual , 1 can be , in some degree at least , handed FACTORS AND MECHANISM OF EVOLUTION 55.
Página 57
... characters . Finally separation or isolation tends to preserve a special line of heredity from being merged in the mass which constitutes the parent stock or species . Without individual variation , no change could take place ; all ...
... characters . Finally separation or isolation tends to preserve a special line of heredity from being merged in the mass which constitutes the parent stock or species . Without individual variation , no change could take place ; all ...
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