Red oceanic tides can be due to

  • A
    Diatoms
  • B
    Dinophyceae
  • C
    Red algae
  • D
    Blue-green algae

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An $X$ reproduces in such great numbers that the water may appear red,producing red tides and killing large marine animals like $Z$. $X$ belongs to $Y$. Identify $X$,$Y$,and $Z$.

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