Jeff's dog barks and growls at the sound of a stranger's car pulling into his driveway, yet the dog wags its tail and gets excited at the sound of jeff's car. in this scenario, the difference in the dog's reactions to the sound of jeff's car and that of a stranger's car is due to

Discrimination                

Explanation:

Discrimination: This is a form of learning, that explains the capability to respond and perceive distinctively to distinctive stimuli. The study is being used in classical conditioning and operant conditioning. The discrimination learning is considered to be more evident than that of generalization.

Animals can be trained for the process of discrimination, as Jeff's dog is being trained for his car sound in the question above.

the answer is solomon northrup. he was a free-born african american, abolitionist and professional violinist that was drugged, kidnapped and sold as slave in 1841 and remained in captivity until 1853 where he regained his freedom with the of the then-governor of new york, washington hunt. he wrote and published his memoirs "twelve years a slave" in 1853, and in this text, he tells the story of his escape thru one of louisiana's swamps (the great pacoudrie swamp) in which he ended up covered in green slime from crossing the surface of the dead water.