What are the advantages of using dynamic routing protocols on a router? When would you use a static route?

You are interviewing for a job as a network engineer at Capelli Networks. They have

several openings. Capelli is a consulting firm that has clients with networks from 10 users to over 10,000. They have put all the candidates for the job in an online discussion group, and given you all the same questions in advance of the interview to determine not only your knowledge of the topics, but to see your writing style and how you interact with other people that may be on your team if they hire you. Capelli may request that the moderator (your instructor) clarify the questions, or ask additional questions.

Here are the questions:

1. What are the advantages of using dynamic routing protocols on a router? When would you use a static route?
2. Cisco is no longer supporting IGRP in the latest IOS versions. Why not? Was it replaced? If so, why?
3. EIGRP has been called a “hybrid” dynamic routing protocol. Why?
4. What are the advantages of using OSPF over EIGRP?