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 208
... BRANCH The Evolution of Horses . Three toed ; all toes used Three - toed ; only central toe used The different ... BRANCH HYPOHIPPUS / BRANCH HIPPIDIUM BRANCH Genera : 2 3 Main stages : I ( 4 ) 5 II Four - toed horses Fig . 126 . 7 8 9 ...
... BRANCH The Evolution of Horses . Three toed ; all toes used Three - toed ; only central toe used The different ... BRANCH HYPOHIPPUS / BRANCH HIPPIDIUM BRANCH Genera : 2 3 Main stages : I ( 4 ) 5 II Four - toed horses Fig . 126 . 7 8 9 ...
Página 209
... branch . The tendency , first revealed in them , runs its course through a couple of genera , culminating in the early Pliocene ( VD 1 ) in Hypohippus . In this branch , with at least ten known species , we can trace a progressive ...
... branch . The tendency , first revealed in them , runs its course through a couple of genera , culminating in the early Pliocene ( VD 1 ) in Hypohippus . In this branch , with at least ten known species , we can trace a progressive ...
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