Vertebrates and tunicates (non-vertebrate chordates) share . :

a. jaws adapted for feeding
b. a high degree of cephalization
c. the formation of structures from the neural crest
d. an endoskeleton that includes a skull
e. a notochord and a dorsal, hollow nerve cord

The  pelagic  region is divided into three zones. the top zone is the euphotic or sunlit zone. this is the ocean zone that sunlight penetrates. because this zone gets sunlight, photosynthesis can occur and plants can grow here.sub  zones. the oceanic zone is subdivided into the epipelagic,  mesopelagic, and bathypelagic zones. the epipelagic (euphotic) zone, also called the sunlit zone, receives enough sunlight to support photosynthesis.your question does not include multiple choice,but i can give you some info on what the 3 zones hope this : -)

The product of 5 rational numbers is positive. at most "five" of these rational numbers can be negative.hope my answer has you : )