Pluto has been downgraded to the status of a protoplanet.
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Q38: Which of the following organisms is defined
Q39: During which geologic time period did Pangaea
Q40: What era, period, and epoch do we
Q41: Which of the following does not characterize
Q42: The early Earth was not hospitable to
Q44: Which organism, developing approximately 4.2 million years
Q45: Mammals did not evolve until the beginning
Q46: What event was responsible for the extinction
Q47: Flying reptiles are a form of dinosaur.
Q48: Most Precambrian rocks lack fossils, which makes
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