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Which of the following events separate geologic time into eras and periods?

O the appearance and disappearance of volcanoes
O the creation of new ocean ridges
O the appearance and disappearance of groups of organisms
O the number of earthquakes occurring at that time​

User EddyG
by
8.4k points

1 Answer

2 votes
option 3
the appearance and disappearance of groups of organisms.
User Winston Fale
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8.4k points
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