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Geological Timeline for the Origin of Life
Grade Level
AP Biology
APB.415 Geological Timeline for the Origin of Life
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Which reasoning chain best supports the correct sequence?
A
Fossils must exist before Earth can form, and hostile conditions end only after fossils are preserved.
B
Earth must exist before its environment becomes less hostile, and fossil evidence appears after that environmental milestone in the AP Biology timeline.
C
The smallest BYA value is always the oldest, so earliest fossil evidence comes first.
D
All early Earth events are equally old, so no sequence is needed.
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