[downwithbgp]

Depending on how much one's willing to stretch that argument, they can also point out that all known life is digital.

Human genome is, effectively, a historical digital record (Nature, DOI: 10.1038/nature10231).

[kragen]

I don't think it's a stretch at all to say that the base sequence of DNA, or the residue sequence of a peptide, is digital, and yes, that's what makes reproduction as we know it possible.

Many aspects of life, however, are analog. Magnesium concentrations, membrane polarizations, molecule orientations, temperature, and so on.