The chart below shows some events in Earth's history and the primary sources of information which were examined to date the events. Earth event Marine animals appear fuel sources appear Mammals appear ferns appear Primary source of information history books fossil in rocks green plants root structures Which of these Earth events was dated using the most valid and reliable source of information? (1 point)
a marine animals appear
b fuel sources appear
ั mammals appear
d ferns appear
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The chart below shows some events in Earth's history and the primary sources of information which we...
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