Which gas began to increase in the atmosphere as a result of photosynthesis by autotrophic prokaryotes approximately 2.7 billion years ago?
A) methane
B) carbon dioxide
C) oxygen
D) hydrogen
Correct Answer:
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Q1: Which group of prokaryotes aids digestion in
Q3: Which groups of organisms colonized land during
Q4: Scientists hypothesize that disrupting our _ communities
Q5: Ribosomes can perform some of the functions
Q6: Which organisms would likely be the most
Q7: Eukaryotes arose about _ years after the
Q8: The prokaryotic group that tends to inhabit
Q9: Bacilli are _ prokaryotes.
A)spherical
B)comma-shaped
C)rod-shaped
D)spiral
Q10: Why is RNA thought to have been
Q11: From what can pre-cells spontaneously form?
A)ribozymes
B)RNA
C)fatty acids
D)DNA
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