The Science of Life, Volumen 4Cassell, 1931 - 896 páginas |
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Página 163
... pass down the necks of the flasks to fertilize the waiting egg - cells . All this is more like animal reproduction than anything we have hitherto related of plants . As the result of fertilization the egg- cell begins to grow , and it ...
... pass down the necks of the flasks to fertilize the waiting egg - cells . All this is more like animal reproduction than anything we have hitherto related of plants . As the result of fertilization the egg- cell begins to grow , and it ...
Página 185
... pass a fluid through such a filter anything bigger than a quarter of a micron across will be held back . This is the limit of microscopic vision . Therefore , we may infer that nothing visible through the microscope will be able to pass ...
... pass a fluid through such a filter anything bigger than a quarter of a micron across will be held back . This is the limit of microscopic vision . Therefore , we may infer that nothing visible through the microscope will be able to pass ...
Página 234
... pass through a great number of separate twigs ; they would appear on the section as circles , and in our analogy they represent those species that are sharply marked off and distinct - such for example as the so - called Maned Wolf of ...
... pass through a great number of separate twigs ; they would appear on the section as circles , and in our analogy they represent those species that are sharply marked off and distinct - such for example as the so - called Maned Wolf of ...
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