biodiversity. this kind of come pplexity does happen easily. >> how did it happen? did it happen here? some people think life started on the land, i think it started at the bottom of the ocean, in hydro thermal vents. the one that people know is a dynamic system, black smoke, they are amazing because nobody expected to see so much life down there. weird forms of life. giant tube worms that don't have a mouth of anus. >> a worm that has neither mouth nor anus, how does it eat? >> it doesn't eat. it basically uses the bacteria that grow inside it to provide it with organic molecules. there's another kind of language i personally think is the answer, i like to think of it as gossip cathedrals, beautiful architecture in the rock. they're actually formed by a much more gentle process. water will percolate down beneath the ocean floor, and there's a particular type of