no it is not. it is a nature protein of fibre
No, silk is a natural fibre.
Yes. Silk fibre comes from their cocoons.
No. Silk fibre is spun by silkworms as cocoons.
Satin is a weave and can be produced from several types of fibre. Pure silk is 100% silk, where woven fabric may be blended or made of pure fibre.
it is a natural fibre
Vicuña fibre , Shahtoosh , cashmere ( Pashmina ,Shahmina ) are the most expensive fibre in the world , they are not silk ( they are wool ) but way more sumptuous , silky , delicate then any type of silk or any fibre .
Natural silk -- the fibre spun by the silkworm to fabricate its cocoon -- is a triangular fibre, shaped like a prism, which reflects and refracts any light.
insect
indeed it does because silk fibre is in sponges so there is your anwser
Silk was not invented it is a natural fibre.
Staple fibre
Silk is such a perfect fibre as it is, the only improvement you can make may be to dye it a different colour.