What is a trait that is ancestral to all chordates? a. a jaw bone b. a notochord c. an amniotic egg d. a vertebral column

B. a notochord 

Chordates are a phylum in the animal kingdom which have the following characteristics

Pharyngeal gill slit
dorsal nerve
notochord
post anal tail

These organisms possess these ancestral traits which have evolved to a more complex and sophisticated features that most animals have today.

Wetlands form where water and land meet. a lake with a wetland fringe can fill in with decayed plant and animal material to become a wet meadow. a pond can fill in to become a bog or fen. sediment can fill in a river marsh to become a swamp.flooding of coastal lowlands from rising sea levels has created broad coastal marshes that are protected from wave action by barrier islands or reefs. coastal wetlands also form when rivers deposit sediment as they reach the ocean. plants then take root and hold the soil firm against the forces of tides and waves.