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4 votes
What type of fossil evidence would be most helpful to a scientist trying to determine how much oxygen was in the atmosphere two million years ago?

A) Ice Cores
B) Tree Rings
C) Carbon Films
D) Trace Fossils

User Yogurt
by
8.0k points

1 Answer

4 votes
Carbon films I believe
User Kingraam
by
8.0k points
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