The Science of Life, Volumen 4Cassell, 1931 - 896 páginas |
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Página 113
... birds that eat meat and have no need of such a device ; there are various shapes of beak and neck , and a tremendous range of coloration . But com- pared , for example , with the mammals the variation of structure found among birds is ...
... birds that eat meat and have no need of such a device ; there are various shapes of beak and neck , and a tremendous range of coloration . But com- pared , for example , with the mammals the variation of structure found among birds is ...
Página 490
... birds . In the tropics there is no irruption of birds that come to breed . In a north temperate region such as Britain , about a third of the breeding species are winter absentees , coming only for the summer ; and among many of the ...
... birds . In the tropics there is no irruption of birds that come to breed . In a north temperate region such as Britain , about a third of the breeding species are winter absentees , coming only for the summer ; and among many of the ...
Página 747
... birds . The development of the brain and especially of the cortex means the progressive replace- ment by flexible responses of the fixed responses of an instinctive system . Putting it compactly , the purely instinctive animal is born ...
... birds . The development of the brain and especially of the cortex means the progressive replace- ment by flexible responses of the fixed responses of an instinctive system . Putting it compactly , the purely instinctive animal is born ...
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