The Ostracoderms Are Found Only in Freshwater Lakes in the Tropics

Q3: The urochordates are<br>A)called tunicates.<br>B)marine animals.<br>C)sessile as adults,but

Q4: In primitive vertebrates,the notochord functions in<br>A)sensory reception.<br>B)coelom

Q5: The perforated pharynx of chordates had an

Q6: Tunicates are sessile organisms with no larval

Q9: The bony fishes currently are divided into

Q10: Urochordates have an unusual feature of their

Q11: Fossils known as _ are very useful

Q13: The jawless vertebrates are called Agnatha,and the

Q13: Amphioxus is certainly not the ancestor of

Q38: The skeletal rod found in all chordates