The Science of Life, Volumen 4Cassell, 1931 - 896 páginas |
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Página 138
... round- worms includes a number of worms of plain , unassuming appearance but nevertheless of great importance to ourselves because a number of them are parasitic . The round- worms often found in the intestines of pigs , horses , and ...
... round- worms includes a number of worms of plain , unassuming appearance but nevertheless of great importance to ourselves because a number of them are parasitic . The round- worms often found in the intestines of pigs , horses , and ...
Página 592
... round the margins of a shallow lake or pond . In every case , whether each grade extends for several hundred miles , like the prairie , or for a few feet , like the belt of bulrush round a pond , a striking fact is to be noticed ...
... round the margins of a shallow lake or pond . In every case , whether each grade extends for several hundred miles , like the prairie , or for a few feet , like the belt of bulrush round a pond , a striking fact is to be noticed ...
Página 745
... round the backwardly - projecting bit of wire - netting to the prize . You may say that the problem is so stupidly simple as to be no problem . Not at all . The hen never solves it properly . So long as it sees and wants the food it ...
... round the backwardly - projecting bit of wire - netting to the prize . You may say that the problem is so stupidly simple as to be no problem . Not at all . The hen never solves it properly . So long as it sees and wants the food it ...
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