According to my Bio textbook, which I bought used for $3.50 ("tree fiddy" fo realises), life is currently defined by 7 characteristics.
- cellular organization (seems debatable IMO)
- ordered complexity
- sensitivity
- growth and reproduction
- energy utilization
- homeostasis
- evolutionary adaptation (also IMO seems debatable, but not for the creationist reasons)
I think the most valuable lesson here is that used textbooks can be cheap.