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Members of a clade can have different derived and primitive characteristics.
Q9: The Iapetus could be considered the proto-Pacific
Q9: Earth's age is thought by most geologists
Q25: A rock sample containing an isotope with
Q25: _ organisms need no oxygen to survive.
Q27: Each of the major continents at the
Q27: The present geologic time scale is based
Q32: Despite their differences, the terrestrial planets have
Q44: Salt domes commonly are associated with petroleum
Q50: During parts of the Late Paleozoic the
Q56: We are currently in the Quaternary period