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human biology - Why is the chordate nerve cord described as hollow when it appears to be solid? - Biology Stack Exchange
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PPT - Chordates have a notochord and a dorsal, hollow nerve cord PowerPoint Presentation - ID:5424023
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Fig Dorsal, hollow nerve cord Anus Muscular, post-anal tail Pharyngeal slits or clefts Notochord Mouth Muscle segments. - ppt download
![human biology - Why is the chordate nerve cord described as hollow when it appears to be solid? - Biology Stack Exchange human biology - Why is the chordate nerve cord described as hollow when it appears to be solid? - Biology Stack Exchange](https://i.stack.imgur.com/OT7Rtm.png)