Multiple Choice
Metabolism may have begun when ____ within rocks donated electrons to dissolved carbon monoxide (CO) , forming organic compounds.
A) oxygen
B) iron sulfide
C) carbon dioxide
D) hydrogen gas
E) ammonia
Correct Answer:

Verified
Correct Answer:
Verified
Q3: The oldest multicellular eukaryote, a(n) _, can
Q4: Oxygen released by _ accumulated in early
Q5: A protocell is capable of self-replication.
Q6: Which organism arose first?<br>A)archaea<br>B)animals<br>C)fungi<br>D)plants<br>E)protists
Q7: Cyanobacteria are ultimately responsible for the ozone
Q9: Ribosomes can catalyze formation of peptide bonds.
Q10: All species on Earth today are descended
Q11: Who demonstrated the possibility of producing organic
Q12: Astrobiologists study Earth's _ to find clues
Q13: What compound served to contain interacting organic