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The allochthonous microorganisms of an ecosystem are

  • A.Indigenous microorganisms
  • B.Migrant
  • C.Parasitic
  • D.Pathogenic

Answer: B

Allochthonous organisms are those that come from outside the ecosystem, so the allochthonous microorganisms are migrants. The indigenous ones, which originate in the ecosystem, are autochthonous. Parasitic and pathogenic describe a mode of life, not an origin. The answer is migrant.

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