Why does an ebonite rod get negatively charged on rubbing with fur ?

Why an ebonite rod gets negatively charged when it is rubbed with fur?

On the basis of electron transfer, explain, why an ebonite rod gets negatively charged on rubbing with cat's skin.

On the basis of electron transfer, explain, why a glass rod gets positively charged on rubbing with silk.

An ebonite rod held in hand can be charged by rubbing with flannel but a copper rod cannot be charged like this.why?

An ebonite rod held in hand can be charged by rubbing with flannel but a copper rod cannot b charged like this, why?

Assertion : When we rub a glass rod with silk, the rod gets positively charged and the silk gets negatively charged. Reason : On rubbing, electrons from silk cloth move to the glass rod.