$A:$ An organism is the basic unit of an ecosystem.
$R:$ The interaction between biological communities forms the structure of ecology.

  • A
    Both $A$ and $R$ are true,and $R$ is the correct explanation of $A$.
  • B
    Both $A$ and $R$ are true,but $R$ is not the correct explanation of $A$.
  • C
    $A$ is true,but $R$ is false.
  • D
    Both $A$ and $R$ are false.

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