The New Encyclopædia Britannica in 30 Volumes: Macropædia : Knowledge in Depth. - 19 Bd, Volumes 1-19Encyclopædia Britannica, 1974 |
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Page 144
... natural the normal genetic processes of breeding and selection , enemies and the pest population results in self - regulating man has been able to modify many natural varieties of mechanisms that , when successful from man's point of ...
... natural the normal genetic processes of breeding and selection , enemies and the pest population results in self - regulating man has been able to modify many natural varieties of mechanisms that , when successful from man's point of ...
Page 148
... natural enemies are not effective in cides are not very selective , physiologically , among the all crops . Or a pest may be so difficult to control as to arthropods , for they usually kill broad groups of organ- require a highly toxic ...
... natural enemies are not effective in cides are not very selective , physiologically , among the all crops . Or a pest may be so difficult to control as to arthropods , for they usually kill broad groups of organ- require a highly toxic ...
Page 435
... natural soil - vegetation tinents . A high degree of tectonic mobility characterizes cover is disturbed , whether by man's activities or natural the ocean floor , particularly in the vicinity of oceanic causes . Rather widespread ...
... natural soil - vegetation tinents . A high degree of tectonic mobility characterizes cover is disturbed , whether by man's activities or natural the ocean floor , particularly in the vicinity of oceanic causes . Rather widespread ...
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activity America animals appear areas atoms became become body called camera century changes chemical Church colour common complete compounds consists containing continued drugs early effect electrons elements energy example existence experience Family field Figure fins fishes human important increase individual industry islands Italy known later less light liquid living lower major material means ment methods movement natural North occur organic original Peking Pentecostal percent period Persian personality pest Peter petroleum phase Philip philosophy photographs plant political position possible practice present pressure printing problems production Quakers range region remains result rocks similar social South species structure surface temperature theory tion United University usually widely