Because the system had worn out and decayed during the yuan dynasty
True.
Behaviors expected of social group members. if group norms conflict with those of the general culture, members of the group may find themselves described as outcasts or criminals.
It indicates that nature must furnish youngsters with a biological, prewired, universal grammar, enabling them to comprehend the essential rules of all dialects and to apply these guidelines to speech they hear.
Noam Chomsky presented the theory that the LAD represent the quick speed at which kids appear to learn dialect and its rules. Later advanced into Chomsky's more prominent hypothesis of universal grammar.
<span>lived; as hunter-gathers</span>