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Punctuated Equilibrium

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... forms in the fossil record persists as the trade secret of paleontology. The evolution trees that adorn our textbooks have data only at the tips and ... – PowerPoint PPT presentation

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Title: Punctuated Equilibrium


1
Punctuated Equilibrium
2
Harvard paleontologist Stephen Gould, Niles
Eldridge and Steven Stanley said, The extreme
rarity of transitional forms in the fossil record
persists as the trade secret of paleontology.
The evolution trees that adorn our textbooks have
data only at the tips and nodes of their
branches, the rest is inference, however
reasonable not the evidence of fossils.
3
In an attempt to explain the gaps at the species
level, they conceived of the punctuated
equilibrium hypothesis.This hypothesis proposes
that evolution occurred in spurts that were so
fast that no fossil evidence was left.
4
Think CriticallyIs the hypothesis based upon the
assumption that the gaps in the fossil record are
factual?The hypothesis demands that there is no
evidence. Is this good science?
5
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