"Errorless" discrimination learning was proposed as a better way to train an animal to respond to a stimulus (S+) and not to respond to another stimulus (S-). In this procedure, there are virtually no errors because .

The controlled use of fire by hominids: (a) limited the expansion of hominids into certain environments, such as dry grasslands. (b) decreased the amount of food energy available in the hominid diet. (c) contributed to geographical expansion and food production techniques in positive ways. (d) has been shown to contribute little to the digestive process of hominids.

Why do you think that historians use the word “revolution” to describe important changes in agriculture? how did the green revolution and other agricultural revolutions change the lives of billions of people? < < read less

Should domestic security cases be handled differently than other types crimes?