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One characteristic of all types of marine mammals is that they rely on a layer of  blubber to help them maintain their body temperature.

Adults of the invertebrate species in the Phylum Chordata look and behave exactly like fish, but have completely flexible bodies because they lack backbones

 Bony fishes as a group are more morphologically diverse than the cartilaginous fishes as a group. 

Gas exchange in many sharks depends on 

Vertical zonation patterns in the distribution of prominent space-occupying species is due to differences among species in their ability to tolerate air exposure at low tide  

Adult Ascidiacea (sea squirts) feed similarly to sponges, by pumping water through their bodies and filtering out the tiny microorganisms and other organic particles (although sponges are more efficient at capturing the very tiny bacteria-sized particles).

One advantage of diminished populations of green turtles is that sea grass blades are allowed to grow longer, benefitting not only the plants, but also the entire ecosystem

Based on Joe Connell’s experiments to investigate the distribution of large and small barnacles in the rocky intertidal, what happened when the small barnacles were transplanted lower in the intertidal?

Peak diversity at intermediate levels of disturbance is a result of both r and K selected species, as well as species with intermediate life histories, being present simultaneously in the   community.

Reflecting their more ancient evolutionary history, a greater proportion of shark species than of boney fish species reproduce by spawning eggs and sperm into the water  column.