Within biological communities, some species are important in determining the ability of a large number of other species to persist in the community. Such species are called

  • [AIIMS 2010]
  • A

    keystone species

  • B

    allopatric species

  • C

    sympatric species

  • D

    threatened species

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$A$ : Fig species and wasp have tight one to one relatioinship.
$R$ : Angiosperms and insects are coevolved to perform a plant-pollinator interaction.