Answer:
dear user the answer is option A.oxygen level and water temperature and C.salinity and water temperature.
hope this helps 
if it's useful to u plz thank and try to mark as brainliest 
 
        
             
        
        
        
Answer: the tails are hydrophobic and the heads are hydrophilic 
 
        
             
        
        
        
Answer:
Option C
Explanation:
In elephant seals, the male arrive the beach first and start establishing its territory. Once their territory is established female elephant seals starts arriving at the beach and prefer mating with the male who can defend their territory or females in his territory from other males. All females in the territory of specific male mate with the male give birth to their pups and after staying for few months move back into the water. 
hence, option C is correct
 
        
             
        
        
        
Salt or bad products that enters ur body
        
             
        
        
        
Answer:
Maintenance of balance and posture.
Explanation: