Without sufficient the colon gets too little exercise and becomes weak.

Fiber.

Explanation:

Fiber is also known as roughage, a type of carbohydrate that cannot be broken down into simple sugars. Fiber helps in digestion, cholesterol maintenance and blood sugar regulation.

Fibers can pass through the intestine relatively intact. Dietary fibers increase stool bulk and aids in digestion process. Fiber deficient diet or very less fiber can cause little exercise of colon and becomes weak.

Thus, the answer is fiber.

characterization of nanoparticles is a critical step in nanomaterial production as it provides information of dimension, morphology, surface charge, distribution and degree of surface functionalization.