Final answer:
It is difficult to determine the exact number of languages yet to be scientifically documented, but it is estimated that a significant number remain unstudied. Experts predict that up to half of the world's languages could be lost by the end of the 21st century.
Step-by-step explanation:
Of the more than 6,000 languages in the world, it is difficult to determine the exact number of languages that are yet to be scientifically documented. However, it is estimated that a significant number of languages have not been thoroughly studied and documented.
Many languages are spoken by a relatively small number of people and may not have a written form. These languages are often at risk of being lost as speakers switch to more widely spoken languages. In fact, experts estimate that up to half of the world's living languages could be lost by the end of the 21st century.
Therefore, while the exact number of languages yet to be documented is uncertain, there is still a considerable amount of work to be done in scientifically documenting and preserving the world's languages.