Cephalochordates Have an Open Circulatory System,and Also Have a Simple

Q24: Of the four chordate hallmarks,adult tunicates have

Q25: During the evolution of the vertebrates,gills changed

Q26: All chordates have<br>A)a single,dorsal,tubular,nerve cord.<br>B)a dorsal heart.<br>C)pharyngeal

Q27: The _ were jawed fishes which lived

Q28: "Sea squirts," the most common kind of

Q29: The post anal tail is seen in

Q30: In vertebrates,pharyngeal gill slits are formed by

Q31: A notochord is present at some time

Q32: The nerve cord of chordates is solid

Q33: Chordates probably evolved from the echinoderm-hemichordate assemblage.