This world is not a home for amoebas, small and large. This world is, in fact, itself a giant amoeba. It floats lazily around its star in an orbit full of space plankton, feeding on that. Somewhere along the way, someone figured out that this particular species of giant space amoeba digests so slowly that it can be lived in safely for years on end and decided to turn it into a vacation spot. Floating on the surface of the amoeba is a receiving station that passes out breathing apparatus for those visitors that need them. There are little 'submarines' adapted to moving through the amoeba, ferrying passengers to various resort towns and even a theme park floating through the creature, though those with the capability are welcome to swim it on their own.