It is thought by scientists that the earliest living organisms
A) originated on another planet.
B) were photosynthetic.
C) used carbon monoxide as a carbon source.
D) used aerobic respiration.
E) made use of sulfur and hydrogen gas as energy sources.
Correct Answer:
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Q2: The Cambrian Explosion provided a wealth of
Q3: Oxygen built up in the atmosphere approximately
Q4: Many biologists feel that the first self-replicating
Q5: Which of the following is not associated
Q6: What term is used to indicate a
Q7: Eukaryotic cells are thought to have
A)appeared about
Q8: According to the endosymbiont hypothesis, what cellular
Q9: Around 580 million years ago, the first
Q10: Atmospheric chemists think that Earth's first atmosphere
A)contained
Q11: When taxonomists classify organisms using a phylogenetic
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