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