Juan wants to teach his dog to bark when someone comes into the yard. At first, he rewards the dog whenever it barks. Then he rewards the dog only if it barks when a person walks by the house. Next, the dog is rewarded for barking only if a person stops by the house, then only if the person touches the gate. Finally, the dog is rewarded only for barking when a person actually opens the gate and enters the yard. Juan is using a step-by-step learning technique called.

alarming its owner that someone is near or inside the house,

you can say an emergency alarmer?

    racial conflict and discrimination has existed ever since man learned to kill with rocks and bones. these conflicts arose from disputes between territory, power, wealth, religion, or simple difference. some of the most infamous racial disputes include slavery, the holocaust, and the civil rights movement.

    these listed disputes often resulted in casualties from all sides. riots, wars, imprisonment, and lynching are all commonly associated with racial conflict on severe levels.

      however, racism is an improving issue in recent decades. people are being more accepting and welcoming of diverse populations. though, the world isn't perfect and it will take much more time, if ever, until the world is rid of racism.

the economic difference between the three colonial regions. shipbuilding, whaling, fishing, and trapping where also main factors to the economy. the southern regional colonies economy was based on sugarcane, rice, cotton, tobacco, and indigo.