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The primary producers of the deep-sea hydrothermal vent ecosystem are

  (a) green algae

  (b) chemosynthetic bacteria

  (c) blue-green algae

  (d) coral reefs

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Correct option (b) chemosynthetic bacteria

 Explanation:

 The primary producers of the deep-sea hydrothermal vent ecosystem are archaebacteria. These have chemosynthetic mode of nutrition. Thus option (b), i.e. chemosynthetic bacteria is the coIIect option.

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