Every time maricella goes to work in the morning, she notices that her dog sulks in the corner of the room and looks very sad. over several weeks, she notices that the dog gets unhappy when she picks up her car keys, immediately before leaving the house. which phenomenon of learning best describes the dog's behavior?

The phenomenom that describes Maricella's dog behavior is called

Classical conditioning.

Explanation:

Classical conditioning is a behavioralist phenomenon that explains how diverse stimuli associated can trigger the same response, but there has to be a natural and neutral stimulus association. In this case when Maricella's dog learns that every time in the morning when Maricella goes up she leaves him alone in the house for several hours. Then he associated the sound of the keys before she goes out and it learned that they are associated. So, the dog will respond with the same behavior for both elements. Because he learned they are associated.

pregnancy happens more and more

i would have a lunch. it's one big package of food, making it one food. : p