Development_of_Life_3

Development_of_Life_3 - Development of Life Development of...

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evelopment of Life Development of Life (continued – again) Stephen Eikenberry 07 September 2010 AST 2037 1
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Cambrian “Explosion” Note the rapid growth in size from a cell, to a few cells (~3 GY); from a few cells to animals (~0.05 GY); from animals to large animals (~0.01 GY) Over only a few million years (versus BILLIONS before) every currently recognized phylum of life on Earth developed in the ambrian explosion (!) Ca b a e p os o (!) 2
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The Cambrian Explosion Initially, at least, land was still totally barren No trees, no plants, no critters, no evidence of bacterial life on land either The sea, on the other hand, was teeming with life! 3
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What Enabled the Cambrian xplosion? Explosion? O 2 levels jumped to nearly “modern” right before the Cambrian explosion All modern animals are O 2 breathers erhaps the O Perhaps the O 2 increase enabled a dramatic increase in iversity/size of diversity/size of animals 4
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K-T Extinction Species extincted included:
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Development_of_Life_3 - Development of Life Development of...

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