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The fossil serves as a chronological record documenting the emergence of new, more complex species from simpler ancestral forms. The fossil record also provides some examples of transitional species that provide evidence of ancestral links between species that exist today.
 
The fossil serves as a chronological record documenting the emergence of new, more complex species from simpler ancestral forms. The fossil record also provides some examples of transitional species that provide evidence of ancestral links between species that exist today.
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Missing links, or [[Transitional Forms]], are undiscovered fossils between two organisms that are supposedly evolutionarily linked. These abrupt changes in the evolutionary line are a cause of doubt to the validity of the evolutionary theory. In 1972, [[Niles Eldredge]] and [[Stephen Jay Gould]] developed the Theory of Punctuated Equilibrium, stating that evolutionary change occurs in rapid bursts, prolonged by periods of little change.
    
===Comparative anatomy===
 
===Comparative anatomy===
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