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Explain the term Protochordata.

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Animals are bilaterally symmetrical, triploblastic and ceolomate. Notochord is present at least at some stages of life. Notochord is a long rod-like structure which runs along the back of the animal. This provides attachment points for muscles. It also separates the nervous tissues from the gut. 

Examples: Balanoglossus, herdmania, amphioxus, etc.

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