Billy: Of course, a JW argument like this against evolution is also an argument against the Noachian flood.
Exactly.
JWs are really reveal their profound lack of intellectual ability whenever they make statements like this. Indeed, if the Noachian flood story is true, then JWs would be required to believe in a much more aggressive form of biological evolution than the one that is generally proposed and accepted in the scientific community. They just don't get it.
They are essentially saying that they believe the present biological diversity on earth (after the initial creation and subsequent destruction at the flood) happened in only a few thousand years whereas evolutionary biologists and related scientist make the claim that it happened over hundreds of millions of years.
Most of JWs don't realize that evolution per se is not even the issue, it's the origin of life question. So silly. If you hope to have an intelligent conversation with most JWs you have to first educate them about how wrong they are about how they think before you can show them how wrong they are about what they "know."