What is person?

What is a person? In one coherent piece of writing, answer the following:

A. Can we give necessary and sufficient conditions that define personhood? If so, what are they, and if not, why not?

B. Explain the thought experiment from Mary Ann Warren concerning how we might decide what personhood is.

C. Give and explain each of the five criteria for personhood we discussed in class.

D. Is it possible there could be humans who are not persons, or persons who are not human? If so, give an example of each. If not, clearly explain why not.