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Fossils of fish appeared approximately 500 mya during the _____________. a. archaen c. proterozoic b. cambrian d. phanerozoic
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Fossils of fish appeared approximately 500 mya during the _____________.

a. archaen
c. proterozoic
b. cambrian
d. phanerozoic

User John Bowers
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The answer is Cambrian.

User Harald Scheirich
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