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(organic chemistry) alkyne
Alkynes play an important role in organic chemistry.
(organic chemistry) alkene
Alkenes play an important role in organic chemistry.
(organic chemistry) alkane
Alkanes are basic components of organic chemistry.
an African American
He is studying the history of African Americans.
parasympathetic nervous system
The parasympathetic nervous system helps our body to relax and conserve energy.
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