Some animals can only live in super salty waters, so that is a big factor, and most animals feed off plankton, and a lot of animals in the ocean need either need to be under a lot of density or a little bit. Which is why there are different Ocean floor levels.
A theory of evolution that states that a species evolves in spurts of rapid change and then goes through periods of no change is known as <span>punctuated equilibrium.</span>
Eukaryotes are larger cells with membrane-bounded organelles. Prokarotes are not that large and do not have a nucleus or any memberane-bound organelles.
