Which of the following has the largest biomass of autotrophs in the world's oceans?

  • A
    Benthic brown algae,coastal red algae,and diatoms
  • B
    Benthic diatoms and marine viruses
  • C
    Sea grasses and slime molds
  • D
    Free-floating microscopic algae,cyanobacteria,and nanoplankton

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