A prerequisite for the survival of life on land was the accumulation of
A) O2 in the atmosphere.
B) CO2 in the atmosphere.
C) water vapor in the atmosphere.
D) O3 in the atmosphere.
E) bacteria in the soil.
Correct Answer:
Verified
Q5: Based on the large numbers of offspring
Q6: The initial accumulation of oxygen in the
Q7: All living organisms acquire _ from their
Q8: The chemical formula for ozone is
A) O.
B)
Q9: Yeasts can be used to study human
Q11: Plants are
A) eukaryotic multicellular autotrophs.
B) eukaryotic unicellular
Q12: Metabolism is
A) the consumption of energy only.
B)
Q13: Darwin noted that all populations have _
Q14: Scientists estimate that for more than _
Q15: A gene controlling human skin color was
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