P (Assertion): The first circulatory system i | vedclass

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(B) $1$. Phylum Annelida is the first group of animals to exhibit a closed circulatory system.$2$. Phylum Annelida is also the first group of animals

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$P$ and $Q$ are both true,but $P$ is not the correct explanation of $Q$.

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(B) $1$. Phylum Annelida is the first group of animals to exhibit a closed circulatory system.$2$. Phylum Annelida is also the first group of animals to possess a true coelom (eucoelom),which is a body cavity lined by mesoderm on both sides.$3$. While both statements are scientifically accurate,the presence of a circulatory system is not the direct cause for the development of a true coelom. They are two distinct evolutionary advancements observed in this phylum.$4$. Therefore,both statements are true,but $P$ is not the correct explanation for $Q$.

$P$ (Assertion): The first circulatory system is observed in the phylum Annelida.
$Q$ (Reason): The first true coelom is observed in the phylum Annelida.

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$A$: The first circulatory system is observed in the phylum Annelida.
$R$: The first true coelom is observed in the phylum Annelida.

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$P$ (Assertion): The first circulatory system is observed in the phylum Annelida.$Q$ (Reason): The first true coelom is observed in the phylum Annelida.