A biologist uses a time machine to collect living material from two different time periods. Sample A is 3 billion years old and sample B is 1.5 billion years old. How would these samples differ?
A. Eukaryotic organisms would be present in both samples but much more common in sample B.
B. Prokaryotic organisms would be abundant in sample A but absent from sample B.
C. Prokaryotic organisms would only occur in sample B.
D. Eukaryotic organisms would be absent from sample A.
Answer: D
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