Questions

A graph that describes the maximum amount of one good that can be produced for every possible level of production of the other good is nothing but a production possibilities curve.

Kangaroo.

The system unit of a personal computer typically contains microprocessor, disk controller and serial interface but it does not contain modem.

A postage stamp on the letters, parcels, ... for post will be on the corner of the post but it travels around the world to any address we want send that.

Internal marketing is the process of motivating and empowering the employees of a company to work as a team for the overall well-being of the customers and thereby the company itself. This is actually the core to succes of a company. A harmonised effort  within the company is an utmost necessity to provide customers with services at a desired level. If a firm doesn't deliver the service it promises in its marketing campaign, it will fail for sure. And it only can keep that promise when all of its employees at all levels realise what actually it is going to deliver. 

Executive Branch of government is responsible for enforcing laws.