What is the function for integral proteins?

Integral membrane proteins function as transporters, channels (see Potassium Channel), linkers, receptors, proteins involved in accumulation energy, and proteins responsible for cell adhesion. Examples include insulin receptors, Integrins, Cadherins, NCAMs, and Selectins.

The answer is observations and interpreting.

Iwould say overuse ( but not 100% sure ) in the u.s. we tend to overuse water by leaving it running, throwing it away, taking long showers, etc.