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OpenStudy (quickstudent):
Birds first appeared and rose to prominence during the: a. Precambrian b. Paleozoic Era c. Mesozoic Era d. Cenozoic Era
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OpenStudy (anonymous):
The mesozoic era.
OpenStudy (abhisar):
Mesozoic era
OpenStudy (abhisar):
Jurrasic period,
OpenStudy (abhisar):
This is a good refrence website for questions like this http://www.enchantedlearning.com/subjects/Geologictime.html
OpenStudy (deepika.comet):
thankz for giving the link @Abhisar
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