Vascularized tip of their free end of a tubeworm which is an organ for exchanging compounds with the environment. [ http://en.wikipedia.org/wiki/Giant_tube_worm#Body_structure ]
This is just here as a test because I lose it
Vascularized tip of their free end of a tubeworm which is an organ for exchanging compounds with the environment. [ http://en.wikipedia.org/wiki/Giant_tube_worm#Body_structure ]