use</U>: This concept should be generalized to include the diverse
homes (-nests, burrows, cavities, interstices, webs, mounds, hollow trees,
logs, host exteriors and interiors, atmospheric dust and cloud particles,
etc) of all organisms; shells, exoskeletons, skin, bodies, the skull and
blood-brain barrier, etc; cells, plasmalemmas, misc. membranes, etc; ecological
niches, ecosystems, and the bios; as well as the 'houses' of inanimate
phenomena: atmospheres, planets, the heliosphere, the galactic atmospher