Biology 9700 · AS & A Level · The microscope in cell studies

The microscope in cell studies — practice question

The World Health Organization (WHO) aimed to eliminate polio through the use of vaccines by the year 2000. Even so, cases are still being reported in some regions of the world after this date. What accounts for these new cases of polio?

  • A1 only
  • B1 and 2 only
  • C1 and 3 only
  • D2 and 3 only

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