OP: A Teacher of mine once gave that definition, and then proceeded to point out that mules are unable to reproduce, and therefore technically unable to evolve. His point was simply that "Life" is very hard to define without including things normaly considered non-life or excluding things considered alive.
edited 1st Feb '11 10:16:59 AM by uximata
"Development: Organisms change over time, such growing in size, undergoing the stages of interphase, or going from a set of gametes to an egg to an embryo to an infant to an adult."
That would exclude most immortals, but not Age Without Youth types. Or the ones who gradually look more and more inhuman.
edited 1st Feb '11 2:30:17 PM by Ettina
If I'm asking for advice on a story idea, don't tell me it can't be done.Wouldn't that depend on what you mean by change? An immortal might change their worldview, for instance.
[1] This facsimile operated in part by synAC.

Going from what Integrated Principles of Zoology, 14th Edition, says (I save all my college textbooks), the qualities of life are:
So, going from that, it seems the issue is more that your teacher is not fully versed in the subject s/he's teaching, or at least not the modern developments of it. I wouldn't say s/he's crazy, however.
edited 1st Feb '11 9:58:45 AM by Miijhal