<P> Linguistic study of Slavic history has focused on three main areas: </P> <Ul> <Li> place names </Li> <Li> the names of flora and fauna </Li> <Li> "lexical and structural similarities and differences between Slavic and other languages". </Li> </Ul> <Li> the names of flora and fauna </Li> <Li> "lexical and structural similarities and differences between Slavic and other languages". </Li>

What elements involve the reasons for decline of the kievan principality