Williams syndrome is the result of a deletion of the 7q11.23 region of chromosome #7 containing the elastin gene and is believed to be a contiguous gene syndrome. Diagnosis of Williams syndrome is confirmed by dual colour FISH using a specific probe and a control probe.
Exert is defined as to put forth or into use with great energy. An example of exert is to put lots of energy into exercising. YourDictionary definition and usage example. exert. to put forth or use energetically; put into action or use: to exert strength, influence, etc. to apply (oneself) with great energy or straining effort Origin of exert
If the box is being carried at constant velocity, then no net force is necessary to keep it in motion. The force exerted by the person is an upward force equal to the weight of the box, and that force is perpendicular to the motion. If there is no motion in the direction of the force, then no work in done by that force. Yet you certainly feel like you are doing work if you carry a heavy box. The resolution of the paradox is similar to the first example-your muscles must maintain an extra tension to stay upright under the load.