Difference between Wool and Silk Fiber

Wool fiber: 
Wool is the natural highly crimped textile fiber
obtained from sheep and other animals. Wool is the first fibers to be
spun into yarn and into fabric. It’s surface consists of a series of
serrated scales, which overlap each other like as scales of fish. It has
a higher ignition threshold than many other fibers and is flame
retardant up to 600 degree Celsius. Silk fiber:

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