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Q10: Urochordates have an unusual feature of their
Q16: Comparative biochemical data are sometimes useful for
Q18: Pikia,the earliest known chordate collected from the
Q27: The Spencer-Bain principle became the cornerstone of
Q37: The propulsive mechanism of a fish is<br>A)its
Q43: The "9 + 2" tube of microtubules
Q43: Commensalism differs from mutualism by the fact
Q44: Leeches secrete both an anesthetic and _
Q46: Hagfishes<br>A)are entirely freshwater animals.<br>B)are parasitic.<br>C)belong to the
Q66: The _ tends to assume that the