The Science of Life, Volumen 4Cassell, 1931 - 896 páginas |
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Página 20
... answer that imperious demand from within again . He may answer it once or twice . Three or four times a day he loads his stomach to keep his wheels going round - and several times , we must note , he has to deposit the residue of their ...
... answer that imperious demand from within again . He may answer it once or twice . Three or four times a day he loads his stomach to keep his wheels going round - and several times , we must note , he has to deposit the residue of their ...
Página 687
... answer to all the possible questions which our varied universe can put to it : it can pulse . It can vary the emphasis of its answer by pulsing more strongly or less strongly ; that is all . A sea - urchin is a feudal system of re ...
... answer to all the possible questions which our varied universe can put to it : it can pulse . It can vary the emphasis of its answer by pulsing more strongly or less strongly ; that is all . A sea - urchin is a feudal system of re ...
Página 761
... answer that briefly here . Indeed , we cannot answer it decisively at all . But the rest of this Chapter and the next two Chapters following it will be contributory to the reader's judgment on the matter . Perhaps these questions , so ...
... answer that briefly here . Indeed , we cannot answer it decisively at all . But the rest of this Chapter and the next two Chapters following it will be contributory to the reader's judgment on the matter . Perhaps these questions , so ...
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