In a pyramid of biomass, $P$ is at the highest trophic level, $Q$ is at the second trophic level, and $R$ is at the lowest trophic level. Identify $P, Q,$ and $R$.

  • A
    Herbs and Shrubs, Trees
  • B
    Trees, Herbs and Shrubs
  • C
    Trees, Shrubs, Herbs and Grasses
  • D
    Shrubs, Herbs and Grasses, Trees

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