The Science of Life, Volumen 4Cassell, 1931 - 896 páginas |
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Página 94
... becomes completely embedded . It lies in a little burrow , surrounded on all sides by uterine tissue and bathed by the blood of the mother . As a result of its implantation the germ has become a parasite upon its mother and is in a ...
... becomes completely embedded . It lies in a little burrow , surrounded on all sides by uterine tissue and bathed by the blood of the mother . As a result of its implantation the germ has become a parasite upon its mother and is in a ...
Página 164
... become stems and leaves of a primitive kind and sprouts root - like hairs down into the soil . In this way the protonema gives rise tiny flasks , with necks down which the sper- matozoa swim to the waiting egg - cells . Then the ...
... become stems and leaves of a primitive kind and sprouts root - like hairs down into the soil . In this way the protonema gives rise tiny flasks , with necks down which the sper- matozoa swim to the waiting egg - cells . Then the ...
Página 645
... become so dependent upon his drug that sudden and complete cutting off of his supply may kill him . But tobacco can spread its milder , more insidious dominion over one's life in the same way . It is easy for a sedentary worker who gets ...
... become so dependent upon his drug that sudden and complete cutting off of his supply may kill him . But tobacco can spread its milder , more insidious dominion over one's life in the same way . It is easy for a sedentary worker who gets ...
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