Multiple Choice
You have just invented a time machine and you want to investigate the past (the dream of every paleontologist!) . When is the earliest time in Earth history that you could go back and not have to have an oxygen tank so that you could breathe normally?
A) Cambrian Period
B) Phanerozoic Eon
C) Archaean Eon
D) Quaternary Period
E) Devonian Period
Correct Answer:
Verified
Correct Answer:
Verified
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