Ais a highly structured group formed for the purpose of completing certain tasks or achieving specific goals

I believe the answer is: formal organization

one of the most noticable characteristic of a formal organization is a clear hierarchy of power that dicate who held the higher position for command in the organization.  This organization tend to be less influenced by idelas, but they tend to be really good in picking up highly skilled members that can help the organizaiton in achieving its goals.

explanation:

may i ask what challenges?

you probably know the answer. stop asking stupid questions and making me waste my time. j.k. ; )   b.t.w. what are three ratios equivalent to 5 : 11? thx