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Based on the map I've attached, I'd say that Christianity spread to
most of the Roman Empire by 476 AD. If you look at the map, you will see that before 325, there were some places in Spain and Italy mostly where Christianity existed, however, after that year, it only continued spreading throughout Europe, which mostly belonged to the Roman Empire at the time.
Answer:
Fossil Records; because you could use the records to see how whales evolved over time, the other options would not give you the information your're looking for.
Explanation:
The third answer best describes the reason.