choose the correct answer
A. cenozoic era
B. paleozoic eraa
C. mesozoic era
D. pre cambrian

1. end ordovician-25% of marine vertebrate families and 57% of genera became extinct (443 ma)

2.devonian-50-55%of marine invertebrate genera and 70-80% of species go extinct (364 ma)

3. permian-greatest extinction event:90% of all species became extinct (250 ma)

4. end cretaceous-extinction of the dinasours,60-80% of all species became extinct (65 ma)

5. late pleistocene-nearly all large mammals and birds (>45 pounds) became extinct (.01 ma)
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