Mention any two methods of reducing friction .

Mention two methods of reducing friction.

(a) What is friction ? Give its advantages and disadvantages. (b) Mention a few methods of reducing friction

Describe any two methods of reducing friction.

Friction is necessary evil, comment. Mention some methods of reducing faction.

What are the methods of reducing friction?

What are the methods of reducing friction?/

Mention any two methods of introducing allen DNA into the host .