The Physical Basis of SocietyD.Appleton, 1928 - 526 من الصفحات |
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الصفحة 90
... eaten or digested by animals and some of the carbon in the bodies of animals is not available as plant food . The bacteria step in again and by a series of processes make the carbon once more available . Soil fertility is not , as ...
... eaten or digested by animals and some of the carbon in the bodies of animals is not available as plant food . The bacteria step in again and by a series of processes make the carbon once more available . Soil fertility is not , as ...
الصفحة 92
... eaten and they cannot be dislodged by starvation . Thirty trillions are said to be excreted daily by the human being . The alimentary canal of the infant is wholly free from mi- crobes at birth , but within a very few hours thereafter ...
... eaten and they cannot be dislodged by starvation . Thirty trillions are said to be excreted daily by the human being . The alimentary canal of the infant is wholly free from mi- crobes at birth , but within a very few hours thereafter ...
الصفحة 93
Carl Kelsey. FORMS OF ASSOCIATION The wood of trees is eaten by few insects , as they do not seem to be able to digest the cellulose . The white ants or termites , however , feed freely on wood . It has been learned that they have in ...
Carl Kelsey. FORMS OF ASSOCIATION The wood of trees is eaten by few insects , as they do not seem to be able to digest the cellulose . The white ants or termites , however , feed freely on wood . It has been learned that they have in ...
الصفحة 100
... eaten by some insect . If all the feeders on vegetable life were allowed to develop ab- solutely without check during two successive years , the first of them would see every green thing swept from the face of the earth , and the second ...
... eaten by some insect . If all the feeders on vegetable life were allowed to develop ab- solutely without check during two successive years , the first of them would see every green thing swept from the face of the earth , and the second ...
الصفحة 102
... eaten by bass ; crayfishes would accordingly increase and prey more heavily upon the aquatic insects . The combined attacks of pickerel and crayfishes would cause insects to decrease and the number of pickerel would fall away because of ...
... eaten by bass ; crayfishes would accordingly increase and prey more heavily upon the aquatic insects . The combined attacks of pickerel and crayfishes would cause insects to decrease and the number of pickerel would fall away because of ...
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عبارات ومصطلحات مألوفة
acres Africa alloy America appears areas Asia atoms average bacteria birds black bass body carbon carbon dioxide cattle cause cells Cenozoic cent century changes chemical chlorophyll climate coal common compounds crops cultivated culture death rate destroy disease distribution domestic animals early earth eaten eggs elements enemies Europe evidence fact fish forms germ germ cells hawk heat horse human hydrogen Ibid important increase Indian insects iron killed known land later light live man's metals mice migration miles moth native nature neolithic nitrogen ocean organisms oxygen Pará rubber tree parasites plants and animals population pounds produce protoplasm R. S. LULL race regions rodents season seeds seems sharp-shinned hawk sheep soil South South America species square mile substances sugar supply surface survive tarpan temperature thousand tion to-day trees tropics types United wild