According to the dictionaries, the character 绍 means "to carry on, to continue". Looking at its etymology, I found nowhere saying nothing else from it being composed of silk (纟) and the sound 召 [zhao]. Even back in the days it had the meaning "to inherit, to carry on a tradition" and I can't see where the silk comes in.
Apart from that, where does the meaning "to carry on, to continue" relates to the word 介绍? It seems today 绍 is mostly used in the word 介绍 and in city names, like in 绍兴.
1 - Why does 绍 have a silk in it?
2 - What's the meaning of 绍 in 介绍?