In the evolution of animals,a heart to pump t | vedclass

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(A) In the evolutionary history of animals,the phylum $Annelida$ is the first group to exhibit a well-developed circulatory system with specialized pu

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Annelids

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(A) In the evolutionary history of animals,the phylum $Annelida$ is the first group to exhibit a well-developed circulatory system with specialized pumping organs.Specifically,in earthworms (which belong to the phylum $Annelida$),$4$ pairs of thick,muscular,and pulsatile structures known as lateral hearts are present to pump blood throughout the body.

In the evolution of animals,a heart to pump the blood is found for the first time in

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