I believe the answer is: Sheet metal
Self tapping screws are made by creating a gap in the connector within the thread of a crew, which creates a flute and cutting edge just like what we see on tap. This makes self tapping screws able to tap their own hole in a sheet metal while normal screws can't.
The “Description of the World” is one of the most important books in history. It contains the narrative of Marco Polo’s journey from Europe to Asia (at the court of Kublai Khan) in the thirteenth century. The book details information about plant growing in different areas and daily life for citizens in Asian countries who were at war.
This book was also influential to Christopher Columbus who decided to follow a western route to Asia after reading “The Description of the World”
B is likely the correct answer.
There are very few economists who advocate for the privatization of the military as the privatization of military has interesting efficiency and national security concerns. (Militaries in the hands of CEOs...)
Instead, many economists see the military as an example of the government providing for the protection of the collective common good and that it is most efficient and necessary for the government to provide this service.
