The New Encyclopædia BritannicaEncyclopædia Britannica, 1983 - Encyclopedias and dictionaries |
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Page 340
... group usually represents only the location of fossil finds not necessarily the true distribution of the group . In the classification presented here groups indicated by a dagger ( † ) are known only from fossils . CLASS AGNATHA ...
... group usually represents only the location of fossil finds not necessarily the true distribution of the group . In the classification presented here groups indicated by a dagger ( † ) are known only from fossils . CLASS AGNATHA ...
Page 569
... groups of the fishes ) have a well - de- veloped internal skeleton forming a strong and elastic backbone . The thin cycloid scales form a light exoskele- ton that does not impede swift movements in the water . The teleosts appear in the ...
... groups of the fishes ) have a well - de- veloped internal skeleton forming a strong and elastic backbone . The thin cycloid scales form a light exoskele- ton that does not impede swift movements in the water . The teleosts appear in the ...
Page 576
... groups through time The fossil record has served to demonstrate the history of most major groups of animals and plants . It also has been able to throw some light on the mutual relationships and trends of evolution of fossil and recent ...
... groups through time The fossil record has served to demonstrate the history of most major groups of animals and plants . It also has been able to throw some light on the mutual relationships and trends of evolution of fossil and recent ...
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