When zoo keepers needed to teach a bear to let a vet look at the bear's teeth, the keepers started feeding the bear each time he stuck his nose through a slot in a cage door. After two days of that, the keepers fed the bear when he stuck his nose in the slot and let a keeper lift the bear's lip. On the fourth day, they fed the bear when his nose went into the slot, the bear's lip was raised, and a keeper touched the bear's teeth. This approach is called:

An externality can be created by a. people working at a production job and enjoying their work b. a production activity but not a consumption activity c. a consumption activity but not a production activity d. a production activity or a consumption activity externalities a. are always positive, and an example is flu vaccinations b. are always negative, and an example is the pollution created by trucks c. can be negative or positive. logging has a negative externality, and education has a positive externality d. can be negative or positive. a negative externality is having to go to school when you would rather go to the beach, and a positive externality is spending time with your friends

How did dynasties end and how did new ones start?

Arecent challenge to the european union created by a member state is?