Are there any special plants in the ocean?
There are tons of interesting plants in the ocean. This first link explains a bit of the importance of it. Some of the plants now are being used in making medicine, and there are even some that live in super acid areas near fumeroles. There are also tons of very interesting organisms. The second link talks a little about the fumorole creatures and life around those. If you are truly interested in those, keep looking online, as there is a ton of information on it right now.