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Hemichordates show several important affinities with annelids, indicating a degree of evolutionary relationship in terms of organization and physiology. Both groups possess a worm-like, elongated body adapted for burrowing or living in soft substrates, which reflects similarities in their mode of life. The body in both hemichordates and annelids is bilaterally symmetrical and triploblastic, with well-differentiated tissues and organ systems derived from ectoderm, mesoderm, and endoderm. __________ ____ ______ ________ _________ ___ _______ ____ ______ ________ _______ ______.
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