Covalent bonds keep the hydrogen and oxygen atoms together
        
                    
             
        
        
        
Answer:
2
Explanation:
1 is definitely wrong
density must be lower to atop another liquid
in 3 ,I consider the example of water and oil whi has a lower boiling point 
 
        
             
        
        
        
 This is more to do with Bioaccumulation of mercury, where the mercury is absorbed into the issue of animals, and so animals higher in the food chain consume a lot of tissue matter hence increasing mercury content in their system.
        
             
        
        
        
Od. 0-0 does not pair of the Molecules bid it’s polar bond due to certain pairs of molecules not being present within its presentations
        
             
        
        
        
Let's hope she didn't watch it without me or i will never be speaking to her again :))