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's history that you would feel safe visiting without an oxygen tank in order to breathe normally?
A)Cambrian Period
B)Early Archaean Era
C)Late Mesozoic Era
D)Quaternary Period
E)Devonian Period

Question

Quizplus · Accepted Answer

The Answer of 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's history that you would feel safe visiting without an oxygen tank in order to breathe normally?
A)Cambrian Period
B)Early Archaean Era
C)Late Mesozoic Era
D)Quaternary Period
E)Devonian Period

You Have Just Invented a Time Machine and You Want