dhw: But perhaps we have reached a dead end, and I don't want you to be irritated by my picking. There are plenty of other tunes for us to hum (and haw)!-I really think we have reached the end. The experts you keep quoting at me are ones I presented to you. I understand their experimental findings and interpret them differently. We've agreed the odds are 50/50 either they are right or I am right. I base my conclusions on other facts and information about how single cells work and apply that to single-celled animals. 'Nuff said. We will have other discussions I know. I'm now back from a short trip and will resume contributions.