The New Encyclopędia BritannicaEncyclopędia Britannica, 1983 - Encyclopedias and dictionaries |
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Page 14
... natural selection , therefore , is left as the agent responsible for controlling the speed , direction , and in- tensity of evolution . On different grounds , attempts have been made to dis- credit natural selection , particularly by ...
... natural selection , therefore , is left as the agent responsible for controlling the speed , direction , and in- tensity of evolution . On different grounds , attempts have been made to dis- credit natural selection , particularly by ...
Page 271
... natural polymer fibres field . Several new fibres were introduced , however , during this consolidation period . Polyurethanes and polypropyl- enes made a powerful impact ... natural fibres accounted for over 70 percent Fibres , Natural 271.
... natural polymer fibres field . Several new fibres were introduced , however , during this consolidation period . Polyurethanes and polypropyl- enes made a powerful impact ... natural fibres accounted for over 70 percent Fibres , Natural 271.
Page 272
... natural and man- made fibres . Table 1 : Estimated Total World Fibre Production , 1968-69 ( 000,000 lb ) total production percentage Natural fibres Wool 3,537 6.4 Cotton 25,566 46.2 Silk 83 Flax 1,487 Hard fibres and hemp * 2,421 0.15 ...
... natural and man- made fibres . Table 1 : Estimated Total World Fibre Production , 1968-69 ( 000,000 lb ) total production percentage Natural fibres Wool 3,537 6.4 Cotton 25,566 46.2 Silk 83 Flax 1,487 Hard fibres and hemp * 2,421 0.15 ...
Contents
would become the principal reserve asset while gold | 36 |
Excretion the elimination of the waste products of | 50 |
Volumes | 431 |
Copyright | |
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acid activity amount animals appears become blood body called carried cause cells century changes chemical close common complete consists containing continuous countries depends direction early effect evidence evolution example existence farm federal ferns fibres field Figure fire function gametophyte give groups important increase interest Italy kidney known later leaves less light lines living major marriage material means ment method move movements muscle natural normal obtained occur organs origin percent period person plants position possible present pressure problems produced properties protection reduced remain renal response result retina selection similar social species structure supply surface temperature tend tion types United urine usually various vary