The Science of Life, Volumen 4Cassell, 1931 - 896 páginas |
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Página 255
... atom is concerned , has run down , and we know no means by which it can be wound up again . The lead thus produced , though in its chemical behaviour quite normal , differs from ordinary lead in having an atomic weight of 206 instead of ...
... atom is concerned , has run down , and we know no means by which it can be wound up again . The lead thus produced , though in its chemical behaviour quite normal , differs from ordinary lead in having an atomic weight of 206 instead of ...
Página 256
... atomic weight of 208 . us Now , the bearing of all this on the com- puting of geological dates is very simple . This disintegration does not go on haphazard and wildly . It is timed . Each of these transformations takes place at its own ...
... atomic weight of 208 . us Now , the bearing of all this on the com- puting of geological dates is very simple . This disintegration does not go on haphazard and wildly . It is timed . Each of these transformations takes place at its own ...
Página 290
... weight a little different from that of the pure line to which it belonged ... atomic theory for our understanding of matter and its chemical ... atomic theory , Mendelism has shown us that what we were used to think 290 BOOK 4 CHAPTER 4 ...
... weight a little different from that of the pure line to which it belonged ... atomic theory for our understanding of matter and its chemical ... atomic theory , Mendelism has shown us that what we were used to think 290 BOOK 4 CHAPTER 4 ...
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