In the vertebrates,the notochord
A) is present dorsal to the nerve cord.
B) is present ventral to the gut.
C) serves as the chondrocranium.
D) has been transformed into the ear bones.
E) is replaced by the vertebrae in almost all species.
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Q3: Root-like extensions of the tunic called _
Q4: When we say "my heart was in
Q5: The endostyle of invertebrate chordates may have
Q6: Members of the subphylum Cephalochordata are called
A)lancelets.
B)tunicates.
C)ammocoetes.
D)salps.
E)dolioids.
Q7: Terrestrial vertebrates made their appearance approximately 400
Q9: Unlike the classic ascidian sea squirts,some urochordates,such
Q10: The tunic of tunicates is composed of
Q11: These animals are commonly used in introductory
Q12: _ cells in the circulatory system of
Q13: Which of the following animals is not
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