The Science of Life, Volumen 4Cassell, 1931 - 896 páginas |
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Página 105
... species Man , Homo sapiens . In relations of conflict or tolerance with this species there are a very great number of other species , more or less numerous and more or less similar , beasts , birds , and fishes . We have already given ...
... species Man , Homo sapiens . In relations of conflict or tolerance with this species there are a very great number of other species , more or less numerous and more or less similar , beasts , birds , and fishes . We have already given ...
Página 232
... species , for the extreme types are connected together by a grading series of intermediate forms , all breeding freely together . They are simply variations within the limits of a single species . " " But when we take into consideration ...
... species , for the extreme types are connected together by a grading series of intermediate forms , all breeding freely together . They are simply variations within the limits of a single species . " " But when we take into consideration ...
Página 233
... species . And there are animals just different enough to make one wonder whether they should be called differ- ent species or not - and this is where the nice problems arise . Authorities vary widely in the freedom with which they erect ...
... species . And there are animals just different enough to make one wonder whether they should be called differ- ent species or not - and this is where the nice problems arise . Authorities vary widely in the freedom with which they erect ...
Índice
THE RANGE NATURE AND STUDY OF LIVING THINGS | 3 |
66 | 5 |
muscles and related | 8 |
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Términos y frases comunes
active algæ animals arthropods bacteria become birds blood body bones brain branches called capillaries carbon carbon dioxide cells Cenozoic changes chemical chromosomes colour creatures crustaceans digestive Echinoderms eggs elaborate embryo Eocene Everyman evolution example eyes fact female fertilized fish flatworms flowers fluid forms fossils gametes genes germ-plasm glands grow growth heart human Ichthyosaurs important individual insects intestine kidneys kinds land larvæ layer less limbs liver living things lobster lungs male mammals marsupials matter means ment microscopic million molluscs mouse mouth movements muscles mutations nervous system normal notochord Obelia organs ovary ovum oxygen pair parasitic phylum plants polyps produced proteins prothallus protozoa reproduction reptiles round secretion sense-organs sexual shell skeleton skin species spermatozoa sperms spores stage starfish stomach structure substances surface swim tail teeth thyroid tiny tion tissue to-day tube types variations various vertebrates whole worms