Body cells must continuously receive $P$ and release $Q$ produced by the cells. What are $P$ and $Q$ in the given statement?
$P \quad Q$

  • A
    $CO_2 \quad O_2$
  • B
    $O_2 \quad CO_2$
  • C
    $CO \quad O_2$
  • D
    $O_2 \quad CO$

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