$A$: The first circulatory system is observed in the phylum Annelida.
$R$: The first true coelom is observed in the phylum Annelida.
$R$: The first true coelom is observed in the phylum Annelida.
- ABoth $A$ and $R$ are true.
- BBoth $A$ and $R$ are false.
- C$A$ is true and $R$ is false.
- D$A$ is false and $R$ is true.
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