The first circulatory system is observed in t | vedclass

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

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Annelida

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

The first circulatory system is observed in the members of this phylum.

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