Which animal is the primary source of the strong extension material used in weaving, found in the mountains of Tibet and Central Asia?

The primary source of strong extension material used in weaving from the mountains of Tibet and Central Asia is the yak. Yaks are domesticated animals that thrive in harsh, high-altitude environments, making them well-suited for the region. Their long, coarse hair is finely spun into a durable and resilient fiber that is ideal for weaving textiles. The resulting fabrics are not only strong but also provide insulation, which is essential in the cold climates of their native areas.

In contrast, while lin is a source of linen fiber, it does not originate from the mountainous regions specified in the question, nor does it possess the same strength and texture suited for the types of weaving prevalent in Tibetan culture. Wool is another common fiber used in textiles but typically comes from sheep and is less associated with the specific strong materials derived from yaks. Yarn, while a term that could encompass fibers from various sources, does not specifically point to the unique material derived from yaks that is recognized for its use in traditional weaving practices in that region.