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What does a filter feeder do?

  • A.Hunts and swallows small fish whole
  • B.Grazes algae from rocks on the sea bed
  • C.Absorbs dissolved salts directly through its shell
  • D.Strains particles from the water passing over it

Answer: D

Passing large volumes of water across its tissues and retaining what is suspended in it is exactly what makes a filter feeder a microbiological concern: bacteria and viruses in the water end up concentrated inside the animal, which itself remains healthy.

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