Answer:
The hippopotamus is most similar to the whale in casein protein production.
 
        
             
        
        
        
Microscope technology gives us access to some pretty important/powerful information, however some limitations to it include: resolution limit, low magnification, & poor surface view,
        
                    
             
        
        
        
Phosphate groups are polar and allow the cell to exist in water.
        
                    
             
        
        
        
Answer:
Cell,tissue,organ,organ system
Explanation:
I already took this test
 
        
             
        
        
        
Answer:
Crossing over ensures that organisms of the same parents have differences in genetic content making them unique in one way or the other. 
Explanation:
This question is describing the process of crossing over, which occurs only during prophase I of meiosis. During the process of crossing over, alleles of a gene are exchanged between non-sister chromatids of homologous chromosomes (mother and father chromosomes). 
Hence, a unique GAMETE that has been genetically recombined will be formed. When these gametes are fertilized (egg) or fertilizes (sperm), organisms that are genetically different from their parents are produced. This ensures genetic variation, which is a difference in the genetic content of organisms.