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In which of the following notochord is present in embryonic stage?

1. All chordates
2. Some chordates
3. Vertebrates
4. Non chordates

Correct answer: All chordates

Solution

The notochord is a key chordate characteristic and is present at least in the embryonic stage of all chordates. In many vertebrates it is later replaced by the vertebral column, but its early presence still makes it a chordate trait.

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