David Beorn (firstname.lastname@example.org) wrote: : On 27 Aug 1996, Joan Shields wrote:
: > From: Joan Shields <email@example.com> : > Just look at how variable HIV is. All these mutations all occuring at the : > same time - some are viable and some aren't. Some are better at surviving : > for a while or better at transmission or better at eluding drugs and the : > body's own systems.
: But in all cases, it is STILL HIV, right?? I.e. no evolution occurred - : adaptation, variability of a species yes - but not evolution. No new : "creature" was created.
In Webster's the biological definition of a species is given as:
"...related organisms or populations potentially capable of interbreeding."
The creation of new species is "speciation" ... evolution can exist without speciation. The definition of evolution (according to Webster) is:
5a: the historical development of a biological group (as a race or species): PHYLOGENY 5b: a theory that the various types of animals and plants have their origin in other preexisting types and that the distinguishable differences are due to modifications in successive generations
Darwin's hypothesis (I think) was that evolution caused speciation.
I think it is fair to say that there is direct evidence of evolution, but only circumstantial evidence that evolution resulted in speciation (there may be direct evidence of this too, but I don't know of it).