The earliest known land plants date to the
A) Pleistocene (late Cenozoic era) .
B) Ordovician (early Paleozoic era) .
C) Carboniferous (late Paleozoic era) .
D) Jurassic (middle Mesozoic era) .
Correct Answer:
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Q13: Potassium-40 can be used to date _
Q14: Which of the following environments is thought
Q15: The "big bang" that produced the universe
Q17: The technique called radiometric dating is based
Q18: Which of the following options lists major
Q19: If an isotope has a half-life of
Q20: Miller-type experiments have shown that
A) simple cells
Q21: Which of the following options correctly lists
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