Urochordates have an unusual feature of their circulatory system: their heart pumps blood in both directions.
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Q1: The development of a _ life style
Q2: Vertebrate animals have
A)an endoskeleton.
B)a notochord at some
Q3: The perforated pharynx of chordates had an
Q4: The nerve cord of chordates is solid
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
Q8: Vertebrates differ from other chordates because they
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
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