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Q1: The biggest viral killer is the _
Q12: What does the letter B represent?
Q23: A layer of ozone in the lower
Q29: Which of the following would not be
Q38: The rising and falling air currents in
Q43: Which of the following is not a
Q56: As a result of efforts of researchers
Q60: A large-scale outbreak of an infectious disease
Q80: The Mississippi river was photographed in 1969
Q98: Choose the process in which existing rocks