What factor usually sets a species’ upper limit in the rocky intertidal?

Q27-Q32: In the following 8 questions, choose “A”  if the statement applies best to planktotrophic larvae, or  “B” if the statement applies best to lecithotrophic larvae. Which would do best traveling in a current with an abundance of phytoplankton. 

Sea otters maintain their warm body temperature in the cold water in which their kelp forest ecosystem thrives by

 whales 

Seagrass meadows rarely exhibit zonation of the dominant plant species because

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

Q105-Q112: Multiple Choice   Eliminating a predator that favors the competitively dominant prey species can

bony fishes 

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

Vertical zonation patterns in the distribution of prominent space-occupying species is due to differences among species in their ability to tolerate salt water immersion at high tide