State the factors which determine the quality of wool extracted from a sheep.

The quality of wool is determined by the following factors:

1. Scale Structure: Good wool fibers have scales that overlap like shingles on a roof.
2. Crimp: The crimps or bends in wool fibers make the wool heavier than other textiles and help it retain heat.
3. Diameter: The diameter of wool fibers varies from 15 micrometers to 30 micrometers or more.
4. Length: Longer fibers make finer wool.
5. Color: Wool is generally creamy white in color.