The Science of Life, Volumen 4Cassell, 1931 - 896 páginas |
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Página 199
... labour of finding and digging out fossils and the mental labour of studying them , should be easy . But Nature rarely reveals her secrets cheaply , and we have not yet told of the complications of the task . In the first place , even ...
... labour of finding and digging out fossils and the mental labour of studying them , should be easy . But Nature rarely reveals her secrets cheaply , and we have not yet told of the complications of the task . In the first place , even ...
Página 404
... labour among the members of the little cell - community . Even the simplest sponge has at least three main kinds of cells -outer cells forming a protective layer , flagellated cells sweeping in food , and amoeba - like cells from among ...
... labour among the members of the little cell - community . Even the simplest sponge has at least three main kinds of cells -outer cells forming a protective layer , flagellated cells sweeping in food , and amoeba - like cells from among ...
Página 703
... labour . If you tear a hole in a leaf nest , you will see a gang of workers swarm out and pull the edges of the gap together . Mean- while , on the inside of the breach , another gang ap- pears , each member of which has a grub in its ...
... labour . If you tear a hole in a leaf nest , you will see a gang of workers swarm out and pull the edges of the gap together . Mean- while , on the inside of the breach , another gang ap- pears , each member of which has a grub in its ...
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