Which of the following acts as a pollution indicator?

  • A
    Australian marsupials
  • B
    Lobefins
  • C
    Ichthyosaurs
  • D
    Lichens

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Statement $X$: Lichens are composed of two main components. Statement $Y$: In lichens,the phycobiont is the heterotrophic component and the mycobiont is the autotrophic component.

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$T$.$O$. Diener discovered a

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