Whereas the honeybee's stinger is heavily barbed and cannot be retracted from the skin, because the yellow jacket has a comparatively smooth stinger, it is therefore able to be pulled out and used again.
                    
                
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                Abecause the yellow jacket has a comparatively smooth stinger, it is therefore able to be pulled out and used
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                Bthe comparative smoothness of the yellow jacket's stinger allows them to pull it out and then can therefore use it
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                Cthe yellow jacket's stinger is comparatively smooth, and can therefore be pulled out and used
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                Din comparison, the yellow jacket's stinger is smooth, and thus able to be pulled out and used
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                Ein comparison, the yellow jacket has a smooth stinger, thus allowing it to be pulled out and used
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