The New Encyclopædia BritannicaEncyclopædia Britannica, 1983 - Encyclopedias and dictionaries |
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Page 332
... usually are not strong , fast swimmers but are ca- pable of short , quick bursts of speed to escape a predator . Many of these fishes have their sides flattened , examples being the sunfish and the freshwater angelfish of aquar- ists ...
... usually are not strong , fast swimmers but are ca- pable of short , quick bursts of speed to escape a predator . Many of these fishes have their sides flattened , examples being the sunfish and the freshwater angelfish of aquar- ists ...
Page 530
... usually begins with seed . A few trees , such as poplars ( Populus species ) and willows ( Salix species ) can be more effectively increased by cuttings . Each tree has its own pattern and season of seed bearing , and annual crops vary ...
... usually begins with seed . A few trees , such as poplars ( Populus species ) and willows ( Salix species ) can be more effectively increased by cuttings . Each tree has its own pattern and season of seed bearing , and annual crops vary ...
Page 734
... usually higher than the concentrations of other cations . Sodium - ion- ( Na + - ) bearing minerals seem less reactive , and the Na + concentrations are usually below those of Ca2 + . Minerals bearing magnesium ion ( Mg2 + ) seem even ...
... usually higher than the concentrations of other cations . Sodium - ion- ( Na + - ) bearing minerals seem less reactive , and the Na + concentrations are usually below those of Ca2 + . Minerals bearing magnesium ion ( Mg2 + ) seem even ...
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