Prompt:

One of the key concepts in the abortion debate is the concept of a "person." For ethical questions like those about abortion, a person is the kind of thing that is the bearer of moral rights. Moral rights are also known as natural rights, or universal rights, as they are independent of rights created by legal systems. Moral or natural rights are thus thought to hold independently of the law. If I have a moral right to liberty, for example, it would be wrong to enslave me even if it was legal to do so. But this doesn't explain what is necessary to count as a person, to be the bearer of moral rights. So, what is required to be a person?

Give us some criteria and some reasons for thinking they are the correct criteria.