Question

He 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?
marine animals appear
fuel sources appear
mammals appear
ferns appear

Answer 1

fuel sources reappear

Answer 2

fuel sources appear

Step-by-step explanation:

first sign of life on our planet