if we are descended from pond slime & apes...?, page-7

Bacci

I suggest you begin by making a comprehensive list of the mental & physical constituants that a human life is comprised or composed of.

If you are interested in a scientific (observable) approach, this is a starting point.

For example:

1. Hair
2. Nerves
3. Liver
4. Bile
5. Sensation

etc, etc