Marine vertebrates are vertebrates that live in marine environments. These are themarine fishand the marine tetrapods (primarily seabirds, marine reptiles, and marine mammals). Vertebrates are a subphylum of chordates that have a vertebral column (backbone). Does a invertebrates have a backbone? In...
bony area between gill slits Evolved as a means to close mouth, and then to capture prey First gill arch behind jaw became supporting strut Joined rear of lower jaw to rear of skull Allowed mouth to open very wide, an efficient weapon Jawless fishes today Hagfishes are scavengers in cool...