How echinoderms are closely related to chordates and hemi chordates?
Why porifera have different types of canal system in the body?
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good question good question....
crystal2396:
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Chordates are eucoelomate deuterostomes, and probably share a common ancestor with echinoderms. Three important characteristics unite the Phylum Chordata. At some point in their life cycle, all chordates have a notochord, a dorsal hollow nerve cord, and pharyngeal gill slits.
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