These structures have been installed and operated for a number of reasons: 1  locks allow navigation on large rivers to facilitate boating traffic. 2  weirs create pool environments for diversion into irrigation channels, for pump intakes, recreational boating and swimming, and other aesthetic reasons.
Medical Definition of carbohydrate. : any of various neutral compounds of carbon, hydrogen, and oxygen (as sugars, starches, and celluloses) most of which are formed by green plants and which constitute a major class of animal foods.
What are they? Complex Carbohydrates are one of the two types of carbohydrates, the other being simple carbohydrates. Alternatively known as polysaccharides, complex carbohydrates are composed of a long as well as a complex chain of sugar or glucose molecules.