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Which combination of the following statements is CORRECT for cyanobacteria?P. They can perform oxygenic photosynthesisQ. Usually lamentous forms are involved in nitrogen xationR Nitrogen fixation occurs in heterocystsS. They cannot grow in a mineral medium exposed to light and air

  1. P,QandR
  2. P,SandR
  3. Q:RandS
  4. PrQandS
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