1. The sting is necessary for the bes to defend its home. 



2. Drones do not possess a sting. 



3. The worker's sting is straight, the queen's is curved. 



4. The piercing portion of the sting comprises three parts, the sheath 

 and two lancets. 



5. The venom is supplied by two- glands and has a complex consti- 

 tution. 



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