QUESTION 12 Extant gnathostomes include: O Amphioxus O Dunkleosteus O Chondricht

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QUESTION 12 Extant gnathostomes include: O Amphioxus O Dunkleosteus O Chondrichthyes O Petromyzontiformes QUESTION 13 laws are structures that have been hypothesized to have evolved fromof agnathans. the braincase O teeth O branchial arches O the notochord QUESTION 14 Which of the following is true of placoderms? O They lived during the Late Triassic Period. They were soft-bodied marine animals. O Their head was immobile because t was fused to their bodk. Click Sove and Submit to save and submit. Click Save All Answers to save all answers

Explanation / Answer

12. the extant gnathostomes include chondrichthyes.

the gnathostomes include the jawed vertebrates. in it the extant gnathostomes includes the two major clades chondrichthyes and osteichthyes.

13.the jaws are structures that have been hypothesized to evolve from branchial arches of agnathus.

many scientists belived hypothisized that the jaws were evolved from first branchial arch.

14.one more option is missing.

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