The amount of practice you get by doing your own homework should be adequate to help you master the material.

Garden crops need adequate watering to grow properly.

A compact car may not have adequate interior space for a large family.

Generally an impure material is cheaper than a pure material; the word advantage is not so adequate here - can use pure or impure, this depends on the specific applications.

Anti nutritional factor are material that opposes adequate digestion. E.g Trypsin-soyabean, Gossypol- cottonfeed mill. HORLADTOP

The amount of practice you get by doing your own homework should be adequate to help you master the material.

Garden crops need adequate watering to grow properly.

A compact car may not have adequate interior space for a large family.

Adequate is the adjective