What organic compounds are essential for DNA and RNA to form?
A) ammonia and methane
B) hydrogen sulfide
C) carbon dioxide
D) oxygen
E) amino acids
Correct Answer:
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Q52: The North American Cordillera formed as a
Q53: A major site of sediment deposition during
Q54: During the _ era,the westward-moving North American
Q55: During the late Paleozoic,the present-day North America,Europe,western
Q56: Which of the following is not a
Q58: At the start of the Paleozoic,North America
Q59: The Laramide Orogeny at the end of
Q60: At the start of the Triassic,most of
Q61: A major obstacle the first land plants
Q62: Birds evolved from _.
A)tree-climbing amphibians
B)pterosaurs
C)apatosaurus
D)archaeopteryx
E)gymnosperms
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