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Among tribes in New Guinea that had been isolated for centuries, a significant characteristic is that they had a large number of sophisticated language systems. This highlights the linguistic diversity that developed in these isolated communities over time. New Guinea is known for its rich tapestry of languages, which reflects the unique cultural and social structures of the tribes.

The existence of numerous languages indicates that these tribes developed distinct forms of communication that are complex and nuanced, allowing them to convey specific cultural information and social interactions. This linguistic sophistication can also suggest well-established social structures and cultural identities within each tribe.

In contrast, having no written language or showing no social structure would not accurately represent the complexities often observed within these communities. The idea of a universal language is also inconsistent with the reality of language diversity observed in such isolated groups. They have adapted their languages to suit their unique cultural contexts rather than converging into a single universal form of communication.