Where do synthetic fabrics come from?

Which fibre category would Silk be placed into?

Silk is a natural, raw fibre sourced from the cocoon of the larvae of a silkworm

Wool is a

Polyester is a

Elastane is a

Cotton is a

Which fabric can retain heat, is environmentally friendly and can be used to make jumpers and blankets?

Which fabric is resistant to stretching, easily washable, made from petroleum oil and can be used to make t-shirts, rope and jackets?