Which of the following gases was NOT likely contained in Earth's primary atmosphere?
A) argon
B) nitrogen
C) helium
D) oxygen
E) hydrogen
Correct Answer:
Verified
Q12: Molecular oxygen in the atmosphere originated mostly
Q13: In contrast to Gould's and others mechanism
Q14: Which of the following is NOT a
Q15: Stromatolites,as seen in cross section below,are formed
Q16: The most ancient fossils are found in
Q18: The concept of a "species" is a
Q19: Which of the following is NOT a
Q20: Fossilized feces are termed _.
A)molds
B)amber
C)petrifactions
D)coprolites
E)vertebrates
Q21: All fossils are altered as they are
Q22: Dinosaurs included the largest land animals that
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