The Science of Life, Volumen 4Cassell, 1931 - 896 páginas |
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Página 116
... fish is the fin - a broad , flat expanse ending in a plate of characteristic " fin - rays . " They may be defined as finny vertebrates . There are two sub - classes of fish - the gristly and the bony fish . In the former the skeleton is ...
... fish is the fin - a broad , flat expanse ending in a plate of characteristic " fin - rays . " They may be defined as finny vertebrates . There are two sub - classes of fish - the gristly and the bony fish . In the former the skeleton is ...
Página 439
... fishes , without a gas - bladder , are completely adapted to bottom - life , like rays and skates , or spend much of their time . resting on the bottom , like most dog - fishes . The full perfectioning of the bony fish for water - life ...
... fishes , without a gas - bladder , are completely adapted to bottom - life , like rays and skates , or spend much of their time . resting on the bottom , like most dog - fishes . The full perfectioning of the bony fish for water - life ...
Página 440
... fish which did turn into land vertebrates , and they went part of the same road ; but they never got all the way . Such half - way advance is not much good in the long run . The fish that turned back have peopled the seas ; the fish ...
... fish which did turn into land vertebrates , and they went part of the same road ; but they never got all the way . Such half - way advance is not much good in the long run . The fish that turned back have peopled the seas ; the fish ...
Índice
THE RANGE NATURE AND STUDY OF LIVING THINGS | 3 |
66 | 5 |
muscles and related | 8 |
Otras 62 secciones no se muestran.
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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