extra

Question 1

has pharangeal gill slits, a notochord, dorsal back chord like animals with vertebrates. example - pikia.

Answer 1

chordata

Question 2

characterized by joints in the spine that bend. include chondrichyes. mineralized internal skeleton, bone divided into elements. include gnathostoma who have true jaws

Answer 2

vertebrata

Question 3

in the gnathostome lineage - evolve into bony fish _____ and ______, lobey fins and are homologous to _____

Answer 3

Osteichthyes (bony fish), sarcoptergi (lobe fins). vertebrata