Answer:
Classical conditioning
Explanation:
Sam is trying to condition his dog to salivate to a bell. He rings the bell and immediately after, while the bell is still ringing, he places food in the dog's mouth. Sam is using classical conditioning.
With the continued use of this conditioning, the dog with time will learn to associate ringing of bell to its feeding time.
In a unitary system of government local offices are subject to the central authority, which in your case the answer would be must follow decisions made by the central government. Hope this helped!
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.
20: checks and balances!
21: Duties: execute law, enforce law, make laws. who does them? EXECUTIVE branch EXECUTEs laws, LEGISLATIVE branch makes laws, and JUDICIAL branch ENFORCES the laws. making sure they are constitutional.
