A very large mass extinction in which trilobites and amphibians disappeared occurred at the end of the a. Precambrian Era. b. Cambrian Period. c. Paleozoic Era. d. Quaternary Period.

A very large mass extinction in which trilobites and amphibians disappeared occurred at the end of the

a. Precambrian Era.
b. Cambrian Period.
c. Paleozoic Era.
d. Quaternary Period.

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A very large mass extinction in which trilobites and amphibians disappeared occurred at the end of the a. Precambrian Era. b. Cambrian Period. c. Paleozoic Era. d. Quaternary Pe…

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