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All bacteria that inhabit the human body are

  • A.heterotrophs
  • B.chemolithotrophs
  • C.autotrophs
  • D.phototroph

Answer: A

Correct answer: heterotrophs

Every bacterium living in or on the human body takes its carbon from organic compounds supplied by the host, so all of them are heterotrophs. Autotrophs and chemolithotrophs fix CO2 and oxidise inorganic compounds, which is a way of life for soil and water organisms, not for inhabitants of a body.

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