Vertebrates differ from other chordates because they have a brain case.
Correct Answer:
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Q3: The perforated pharynx of chordates had an
Q4: The nerve cord of chordates is solid
Q5: Urochordates have an unusual feature of their
Q6: Garstang's hypothesis of vertebrate evolution is the
A)annelid-vertebrate
Q7: All chordates have
A)a single,dorsal,tubular,nerve cord.
B)a dorsal heart.
C)pharyngeal
Q9: Amphioxus is certainly not the ancestor of
Q10: Cephalochordates have an open circulatory system,and also
Q11: The urochordates are
A)called tunicates.
B)marine animals.
C)sessile as adults,but
Q12: Pikia,the earliest known chordate collected from the
Q13: The phylum Urochordata includes the
A)Ascidiacea and Cephalaspidomorphi.
B)Larvacea
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