Entities. Non Entities.
Types of biochemistry not known to us..........
''speculated to be scientifically viable.....''(*)
''but not proven''....(*) (by humans) ''to exist at this time''(*).
''If life exists on other planets or moons, it may be chemically similar; it is also possible that there are organisms with quite different chemistries.''(*)
Life forms, which to us may not be perceived to be alive at all.
There may be other places for habitation.
There may be other dimensions for habitation.
They may be all around us. Within us.