Dang i cant quit do that off the top of my head sorry 
        
             
        
        
        
Answer:
the warm water and abundant sunlight in the nertic zone limits the plankton population 
 
        
             
        
        
        
It’s iterative ontogenetic and di - or polymorphic
        
             
        
        
        
Explanation:
To swim, they move their tails up and down, rather than back and forth as fishes do. This is because whales evolved from walking land mammals whose backbones did not naturally bend side to side, but up and down. ... Whales do the same thing as they swim, showing their ancient terrestrial heritage.
Cetaceans are fully aquatic marine mammals belonging to the order Artiodactyla, and branched off from other artiodactyls around 50 mya (million years ago). Cetaceans are thought to have evolved during the Eocene or earlier, sharing a closest common ancestor with hippopotamuses.
 
        
             
        
        
        
this is an example of subtracting