The Physical Basis of SocietyD. Appleton, 1916 - 406 من الصفحات |
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الصفحة ix
... animals and man by bacteria and plants . The fixing of nitrogen . The production of food . Complex series of interrelations in the animal world reaching from the lowest to highest forms . An- imal communities . Ecology . Mutual aid ...
... animals and man by bacteria and plants . The fixing of nitrogen . The production of food . Complex series of interrelations in the animal world reaching from the lowest to highest forms . An- imal communities . Ecology . Mutual aid ...
الصفحة x
... plants and animals . Discovery and cultivation of plants . Origin of cultivated plants . Development of new types . Domestication of animals . Relation of domestic animals to civilization . The be- ginnings of the care of fish , oysters ...
... plants and animals . Discovery and cultivation of plants . Origin of cultivated plants . Development of new types . Domestication of animals . Relation of domestic animals to civilization . The be- ginnings of the care of fish , oysters ...
الصفحة 14
... plants and animals . The construction of the substances we call proteids by the chlorophyll - holding plants takes place only in the light . The lower the temperature the greater the amount of light needed . The influence of light on ...
... plants and animals . The construction of the substances we call proteids by the chlorophyll - holding plants takes place only in the light . The lower the temperature the greater the amount of light needed . The influence of light on ...
الصفحة 15
... animals . Lizards and snakes gradually disappear along with the thick ... plants in our gardens into three groups : tender , half - hardy , hardy ... plants out - of - doors during our hot summers , but we do not change their ...
... animals . Lizards and snakes gradually disappear along with the thick ... plants in our gardens into three groups : tender , half - hardy , hardy ... plants out - of - doors during our hot summers , but we do not change their ...
الصفحة 21
... plants or animals causing disease and the types carry- ing the disease flourish . In Africa the sleeping sickness is carried by the tsetse fly inhabiting the banks of streams and ponds . Malaria disappears in the Middle West when the ...
... plants or animals causing disease and the types carry- ing the disease flourish . In Africa the sleeping sickness is carried by the tsetse fly inhabiting the banks of streams and ponds . Malaria disappears in the Middle West when the ...
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