What are centrifugal and centripetal ?

The inventor cocreated the film fred arts sneeze which was one of the first american movies

Which is the main inference that can be drawn from adam smith's book the wealth of nations? a) for an economy to work flawlessly, it shouldn't have to serve and moral goals. b) the government must control a free-market economy, or economic problems will arise. c) a free-market economy works well only without the government's interference. d) free trade will only hurt economies and should be stopped by governments.

The low and midlevel clouds that look like cotton balls are