Is the presence of myomeres a symplesiomorphic or synapomorphic feature of vertebrates compared to conditions in other deuterostome metazoans? And are these structures symplesiomorphic, synapomorphic, or neither for vertebrates considered alone?

Describe the exoskeleton and examples of organisms with this type of skeleton Which is the main component of the exoskeleton of arthropods?

Which of the following statements regarding dipnoi (lungfish) is true?     amniotes share a more recent common ancestor with dipnoi than with teleosts   early tetrapodomorphs are descended from dipnoi (lungfish)   most features seen in lungfish, such as the ability to estivate below ground during dry periods, represent the ancestral condition for sarcopterygians

What do fossil tetrapods tell us about the transition from water to land?