Explanation:

- Terylene: This is a synthetic fiber, a type of polyester. It's not derived from natural sources like plants or animals. Hence, it is not a natural fiber.

- Jute: This is a natural fiber obtained from the jute plant. It's commonly used for making burlap and similar products.

- Flax: This natural fiber comes from the flax plant. It's used to make linen, which is known for its durability.

- Wool: This natural fiber is obtained from the fleece of sheep and other animals. It's renowned for its warmth and versatility.