Annelids are ..........

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(B) Annelids (Phylum $Annelida$) exhibit the following characteristics:$1$. They are bilaterally symmetrical,not radially symmetrical.$2$. They are tr

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Externally segmented

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(B) Annelids (Phylum $Annelida$) exhibit the following characteristics:$1$. They are bilaterally symmetrical,not radially symmetrical.$2$. They are triploblastic,organ-system level of organization,and coelomate animals.$3$. The most distinct feature of annelids is that their body surface is distinctly marked out into segments or metameres,which is known as metameric segmentation. Therefore,they are described as externally segmented.$4$. They are true coelomates,not pseudocoelomates.Thus,the most appropriate characteristic among the given options is that they are externally segmented.

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