The subunit of proteins is one protein molecule that assembles with more protein molecules to make a protein complex. 
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Two species of crickets, Gryllus rubens and Gryllus texensis, have different courtship sogs which can be identified only by the opposite sex of their own species..... I hope this answer helped you out!
        
             
        
        
        
Dwarfs: B
Giants: C
Main sequence stars: D
Supergiants: A
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