rationalskepticism.org

Good post, Rumraket. But I have a question. As far as I know there are no sponges with even the most rudimentary circulatory system. Was the phylum Porifera just chosen for purposes of illustrating the general concept (in which case I am totally with you), or is there a specific reason that leads you to speculate that it began with sponges? Just curious.

EDIT: Just wanted to point out for Steve's benefit the lack of "groupthink" in this instance, and predict that Rumraket's response will be conducive to coherent and logical conversation in contrast to Steve's myriad ways of ruining productive discussion.