Sea lions use their back, hind flippers and front flippers to easily glide in the water.
Therefore, sea lions is the answer.
Water and those Pointy things
To try and help although thee aren't any answers i would say... if they were to literally conduct a field study such as this, much pollution would occur, Millions of fish would die as of plants also. And would over-all Lake Michigan would never be the same again.
The answer is Heredity! :)
