Grasshoppers have no ears, instead they use an organ called the tympanum located in the first segment of their abdomen, whereas humans take in sound waves through the ear canal until they reach the eardrum. The eardrum picks up the vibrations and then transmits them to tiny bones in the middle of the ear, the bones pass the vibrations to the inner ear (which is filled with liquid) and the cochlea. 
Hope I could help.
        
             
        
        
        
A CELL WALL because the other three appear in different types of cells
        
                    
             
        
        
        
False, each sex cell has one allele so when it combines with the opposing sex cell (depending on the gender) it fills in the gap.
        
             
        
        
        
<span> LOOK up Negative Regulations E. Coil 
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Answer:
B
Explanation:
Reproduction is when a living thing mates and is capable of making another living thing. That means it's the process of NEW living things, because it's being created. Hope that helps:)