Give 4 justification why Ivan Pavlov used animals instead of human beings in classical condition of learning

Magnesium! this is found if caves usually

They probably don't understand either 1. what the nightmare is about or 2. his anxiety and stress

Depression is lifelong, though you can get medication to with it. the difference between sadness and depression is that sadness lasts a little bit, depression last a long time and it goes on and off. people usually get depression through experiences they have been through, or genetics.

Ibelieve this would be an obstacle.