The Early Vertebrate Fossils Belong to an Extinct Group of Jawless

Q39: In both tunicates and cephalochordates,the ventral side

Q40: The ammocoete larvae is important in zoology

Q41: Larval and adult tunicates look virtually nothing

Q42: One overriding advantage of the endoskeleton of

Q43: The lancelets or Branchiostoma are found<br>A)very rarely

Q45: The urochordates are enclosed in a nonliving

Q46: Cephalochordates<br>A)are small fish-like,freshwater animals.<br>B)have a notochord only

Q47: The characteristics of the chordates and the

Q48: Outline the five chordate features.What is the

Q49: What feature(s)can be found in the ammocoete