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प्रश्न
The notochord appears during development in the embryos of:
विकल्प
Only land vertebrates
Only fish embryos
All chordates
Only mammals
MCQ
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उत्तर
The notochord is a structure that appears in the embryos of all chordates. In vertebrates it is subsequently replaced by the vertebral column, making it a temporary embryonic structure that reveals chordate ancestry.
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