Which animal is non-chordate - Protochordate?

Botryllus

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Balanoglossus

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Branchiostoma

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All of the above

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Solution

The correct option is B Balanoglossus
Balanoglossus has some characteristics in common with chordates, such as gill slits and a dorsal nerve cord; however, this species also has a ventral nerve cord that is not hollow like most chordates but is solid. Therefore, they are non-chordates - protochordate.

So, the correct answer is option B.

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