different species. they can be distinguished both through dna, genetically, and also by their appearance. so, marine experts can differentiate species. the interesting thing is different species occupy different areas of the world. you might find a different species in the indian ocean than elsewhere. by analysis of the barnacles on the flaperon, by determining the species, one can basically track the path that this plane element took as it floated toward reunion island. we may be able to narrow down the search area. right now, we are talking 2500 miles, 2400 miles from the area that was searched. now we can narrow that down and maybe find the plane. >> you are saying it can help map out this piece of debris, it's journey, in fact? >> true. that was done by looking at