Stromatolites,as seen in cross section below,are formed by _____. 
A) cyanobacterial calcite
B) coral reefs
C) mounds of bay sharks
D) sedimentary wedges
E) eukaryotic cells
Correct Answer:
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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
Q16: The most ancient fossils are found in
Q17: Which of the following gases was NOT
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
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