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a
All vertebrates are chordates but all chordates are not vertebrates
b
All chordates are vertebrates but all vertebrates are not chordates
c
All vertebrates are jawed animals, but all jawed animals are not vertebrates
d
All vertebrates may not have notochord in a phase or complete life history
answer is A.
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Detailed Solution
All chordates are vertebrates, but all vertebrates are not chordates.The members of subphylum Vertebrata possess notochord during the embryonic period. The notochord is replaced by acartilaginous or bony vertebral column in the adult. Thus all vertebrates are chordates but all chordates are not vertebrates.