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Members of the subphylum ________________ were abundant during the Cambrian period.
Q16: The high-speed wings of plovers and sandpipers
Q30: Explain why fossil specimens of Haikouella lanceolata
Q35: The modified cells of sponges that form
Q35: The typical nervous system of a polychaete
Q38: The skeletal rod found in all chordates
Q40: Nonavian reptiles are different from amphibians in
Q41: The major flight muscles of insects such
Q41: Adaptations for terrestrialism in early tetrapods resulted
Q48: Outline the five chordate features.What is the
Q61: Discuss the significance of members of the