The Science of Life, Volumen 4Cassell, 1931 - 896 páginas |
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Página 461
... insects , the spiders were scarcely differentiated from ticks and mites ; the insects were all of the lower orders , without full metamorphosis ; caterpillars and grubs there were not , nor any resting stages of chrysalis or pupa . All ...
... insects , the spiders were scarcely differentiated from ticks and mites ; the insects were all of the lower orders , without full metamorphosis ; caterpillars and grubs there were not , nor any resting stages of chrysalis or pupa . All ...
Página 463
... insects could be exploited by the expenditure of a few drops of sugar - water . For the insects , new ways of life were opened up , and a whole new winged population came into being entirely nourished by flowers and their secretions ...
... insects could be exploited by the expenditure of a few drops of sugar - water . For the insects , new ways of life were opened up , and a whole new winged population came into being entirely nourished by flowers and their secretions ...
Página 465
... insects is a co - operative evolution . The particular rôle which the flower and its insect visitors now fill in nature's economy is one into which they have crept jointly . If there had not happened to be small winged animals in the ...
... insects is a co - operative evolution . The particular rôle which the flower and its insect visitors now fill in nature's economy is one into which they have crept jointly . If there had not happened to be small winged animals in the ...
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