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It was during the ________ period within the ________ era that chordates made their first appearance.
Q8: In order to infect a cell,a virus
Q11: Water moves into the guard cells in
Q14: Evolution of plants was marked by which
Q17: During the course of fish evolution two
Q18: Ivanowsky first recognized that something smaller than
Q20: Which statement is NOT true about a
Q25: _ are of the same type since
Q27: The stone tools and the dentition of
Q31: A unique species of snail has been
Q42: Which of the following statements concerning dietary