Which oil-rich seed has been utilized for fabric production and in food for 7000 years?

Flax seeds have a long history of use, dating back over 7,000 years, making them notable not just for their nutritional benefits but also for their versatility in various applications. These seeds are rich in omega-3 fatty acids, which contribute to their popularity in dietary contexts. In addition to their nutritional value, flax has been used to produce linen fabric. The fibers from flax plants are spun into linen, a process that highlights the seed's historical significance in textile production.

Flax seeds stand out in this question due to their dual historical significance—both in food as a source of essential fatty acids and in fabric production as a precursor to linen, thus marking their importance across multiple domains over centuries.