The fast dwindling $....A...$ forest is estimated to produce $....B...$ percent of the total oxygen in Earth's atmosphere.

  • A
    $A -$ Siberian,$B -30$
  • B
    $A -$ Temperate,$B -20$
  • C
    $A -$ Alpine,$B -15$
  • D
    $A -$ Amazon,$B -20$

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