The National Geographic Magazine, Volume 193, Issue 3National Geographic Society., 1998 - Geography |
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Page 70
... billion years ago . Before then , con- ditions were thought to be too hellish to per- mit the evolution of fragile cells . But some scientists now think that life didn't wait for the shelling to stop . According to Stephen J. Mojzsis of ...
... billion years ago . Before then , con- ditions were thought to be too hellish to per- mit the evolution of fragile cells . But some scientists now think that life didn't wait for the shelling to stop . According to Stephen J. Mojzsis of ...
Page 73
... billion individuals linked by symbiotic relation- ships that hold the community together . Microscopic views ( left ) show organisms under conditions at Idifferent levels . These microbes use oxygen that seeps from the surface or , when ...
... billion individuals linked by symbiotic relation- ships that hold the community together . Microscopic views ( left ) show organisms under conditions at Idifferent levels . These microbes use oxygen that seeps from the surface or , when ...
Page 80
... billion and 1 billion years ago the pace picked up dramatically as dozens of new species developed . Some had knobby coat- ings ; others , slender spikes or stout horns . One of the sparks for this biological rev- olution may have been ...
... billion and 1 billion years ago the pace picked up dramatically as dozens of new species developed . Some had knobby coat- ings ; others , slender spikes or stout horns . One of the sparks for this biological rev- olution may have been ...
Contents
Naples Unabashed A city schooled in passion chaos and | 32 |
The Rise of Life on Earth Microscopic lifeforms | 54 |
Flashback | |
Copyright | |
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animals asked bacteria Bank beetles began begins believe billion body build California called cells chum CLARITIN close coast coral covered daily dose early Earth eggs evolved eyes feet fish Florida forest forms four ground growing hands head herders hold human hundred inside Islands It's Italy keep light live look loratadine manager MARCH marine miles move named Naples NATIONAL GEOGRAPHIC natural Neapolitans Nenets ocean once organisms original oxygen passed patients photographs plant produce protect reef reindeer remain road rock sanctuary says scientists seemed Serotetta species stand streets studies thing Today tree tundra turned University walking watching West whales young