Questions

The American noncommissioned officer tradition began with creation of the Continental Army in 1775 at the beginning of the American Revolution. They adopted NCO traditions from French NCO.

Pinctada vulgaris is a bivalve from which pearl is obtained.

Free memory is maintained in linked lists, each of equal sized blocks. Any such block is of size 2^k. When some memory is required by a process, the block size of next higher order is chosen, and broken into two. Note that the two such pieces differ in address only in their kth bit. Such pieces are called buddies. When any used block is freed, the OS checks to see if its buddy is also free. If so, it is rejoined, and put into the original free-block linked-list.

A 40% solution of Formaldehyde known as Formalin is used in the preservation of biological specimens because of its hardening action on proteins. 

Marketspace refers to an information and communication based electronic exchange environment. It is a relatively new concept in marketing. Since physical boundaries no longer interfere with buy/sell decisions, the world has grown into several industry specific marketspaces which are integration of marketplaces through sophisticated computer and telecommunication technologies.