The Science of Life, Volumen 4Cassell, 1931 - 896 páginas |
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Página 36
... branch and divide and their branches divide again , so that the blood passes into smaller and smaller canals . At each division the cross area of the two branches taken together somewhat exceeds that of the original trunk , so that the ...
... branch and divide and their branches divide again , so that the blood passes into smaller and smaller canals . At each division the cross area of the two branches taken together somewhat exceeds that of the original trunk , so that the ...
Página 209
... branches started in the early Eocene ( VA 1 ) . Some of the Old World , four - toed forms wandered off on their own ... branch began at the close of the Miocene ( V C ) . Its peculiarity consisted in its retaining three good toes on each ...
... branches started in the early Eocene ( VA 1 ) . Some of the Old World , four - toed forms wandered off on their own ... branch began at the close of the Miocene ( V C ) . Its peculiarity consisted in its retaining three good toes on each ...
Página 443
... branch into a fine crown , each of the branches set thick with little leaves and end- ing in a spore - bearing cone , sometimes a foot or more in length ; or , in some cases , the cones are gathered into clusters near the base of the ...
... branch into a fine crown , each of the branches set thick with little leaves and end- ing in a spore - bearing cone , sometimes a foot or more in length ; or , in some cases , the cones are gathered into clusters near the base of 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