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All chordate possess: — Notochord at some stage of life — Dorsal tubular nervous system — Pharyngeal gill slits at same stage of life

1. a) True for all chordates
2. b) True for vertebrates only
3. c) True for invertebrates only
4. d) True for some chordates

Correct answer: a) True for all chordates

Solution

All chordates share the key diagnostic features of a notochord, a dorsal hollow nerve cord, and pharyngeal slits at some stage of development. These traits define the phylum, even though they may be modified or lost in the adult form.

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