Sharon extinguished her dog's response of salivating every time the electric can opener was used. However, she noticed that after the can opener had not been used for several days, the dog salivated at the sound of the can opener. This situation represents the phenomenon of .

Which best describes the purpose of the south carolina exposition and protest, which was written by john c. calhoun? a) to explain why the south was nullifying the tariff of 1828 b) to describe the ways the tariff of 1828 would southerners c) to persuade northern states to rebel against the federal government d) to ask england for if the south decided to secede from the union