Argy Lacedom wrote:Yes I remember our earlier conversation. For a sexually reproducing organism it is the ability to have fertile offspring. For a non sexually reproducing organism it is a complex calculation on the DNA sequence compared the the ancestor. I gave myself a headache by trying to understand how the AIDs virus evolves in the latest Scientific American. I now realise how complex it is to define a virus as there is no one "ancestor virus" but rather a "pool of DNA sequences" that share familiar set of factors. ( There is no vaccine for AIDS as it infects the actual antibody "receptor" that identifies "viruses".....lets wait for it to become airborne and see what happens...gulp!)
Two points. The term "species" is a slippery one.

