apart from china, which other countries produce that fiber?
India is one of them
Silk
Silk has a long history in India. It is known as "Resham" in eastern and north India, and "Pattu" in southern parts of India.
when did silk begin to be produced in china th millennium BC can you name some species from where we obtain this material? Bombyx mori how do these species release that material? By forming a cacoon by this insect is that material what they release- a cellulose or a protein or a fat? Natural protein fiber what type of proteins do they contain? The Protein fiber of silk is composed mainly of fibroin
wiki:5410209
Silk [SEP] India
Silk has a long history in India. It is known as "Resham" in eastern and north India, and "Pattu" in southern parts of India. Recent archaeological discoveries in Harappa and Chanhu-daro suggest that sericulture, employing wild silk threads from native silkworm species, existed in South Asia during the time of the Indus Valley Civilization (now in Pakistan) dating between 2450 BC and 2000 BC, while "hard and fast evidence" for silk production in China dates back to around 2570 BC. Shelagh Vainker, a silk expert at the Ashmolean Museum in Oxford, who sees evidence for silk production in China "significantly earlier" than 2500–2000 BC, suggests, "people of the Indus civilization either harvested silkworm cocoons or traded with people who did, and that they knew a considerable amount about silk." India is the second largest producer of silk in the world after China.