The first animal phylum to possess a circulat | vedclass

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(B) The phylum $Annelida$ is the first group of animals in the evolutionary sequence to exhibit a true circulatory system. They possess a closed circu

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Annelida

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(B) The phylum $Annelida$ is the first group of animals in the evolutionary sequence to exhibit a true circulatory system. They possess a closed circulatory system,which includes blood vessels and a heart,allowing for the efficient transport of nutrients and gases throughout their body. In contrast,phyla like $Platyhelminthes$ and $Aschelminthes$ lack a specialized circulatory system and rely on diffusion for the transport of substances.

The first animal phylum to possess a circulatory system is: ........

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