Ais a mound of sand that is created by the wind and usually is formed on sea coasts or in deserts. a. hill b. silt c. dune d. loess

  C. Dune

Explanation:  Dune is a typical form of relief of the desert and sandy sea coasts. It represents a hill formed from loose sand, under the influence of  aeolian processes-wind or the flow of water.  It does not represent a permanent form of relief, and therefore should not be considered as a reliable orientation, especially in the desert. After each wind, the dune can change shape and place.

answer; ///i believe that the correct answer is (b); ///the candidate must be a native born american citzen;

answer: (fluidity)is the correct answer.

explanation: because of this characteristic, success on the battlefield depends in large part on the ability to adapt to proactively change events to our advantage as well as to react quickly to constantly changing conditions