The Shape of Life: Origins

A movie we watched. About the origins of life it was about. Interesting I found it to a point. ^_^
Okay, about that movie. It was sort've documentary-like. According to them the first mulit-cellular animal was and is the sponge. Its the same as modern day animals because it shares animal cells, is held together by collegens and feeds. Of course, a sponge doesn't have any internal organs, no limbs, and is about the simplist thing in the world. Scientists have concluded that the fact that it feeds and reproduces sexually makes it an animal. Using the very involved arts of gene splicing they've found that sponges have the very base genes that are shared by ALL animals. Still, after watching that...I'm still not totally convinced that the sponge isn't a plant.