The Science of Life, Volumen 4Cassell, 1931 - 896 páginas |
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Página 209
... close is uncertain . The next divergent branch began at the close of the Miocene ( V C ) . Its peculiarity consisted in its retaining three good toes on each foot , very much splayed out , and teeth less well adapted for grinding grass ...
... close is uncertain . The next divergent branch began at the close of the Miocene ( V C ) . Its peculiarity consisted in its retaining three good toes on each foot , very much splayed out , and teeth less well adapted for grinding grass ...
Página 415
... close of the Paleozoic , the Trilobites became gradually less abundant , less charac- teristic and dominant in the life of the times . There are three striking facts about the life of the early Paleozoic ( III ) . One is the presence as ...
... close of the Paleozoic , the Trilobites became gradually less abundant , less charac- teristic and dominant in the life of the times . There are three striking facts about the life of the early Paleozoic ( III ) . One is the presence as ...
Página 470
... close of the Cretaceous ( IV C ) , all the great land- masses were , either simultaneously or in quick succession , in communication with one another . Then first Australia was shut off , and soon afterwards South America ; while the ...
... close of the Cretaceous ( IV C ) , all the great land- masses were , either simultaneously or in quick succession , in communication with one another . Then first Australia was shut off , and soon afterwards South America ; while the ...
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