Nope, exceptions get their own subclass.  Babies would be baby-humans, the mentally ill would be - well you get the idea.  These classes are actually a predictable reality given an accurate definition of &quot;human being&quot;, a component of the whole.  Imagine a dependency graph, with the edge cases as leaf nodes.  So the definition of human isn&#x27;t related to a single entity, or the averaging of the qualities of the entire population - it is related to the attributes that give rise to the entire structure - seed values.  Again, this has nothing to do with time, so &quot;give rise to&quot; is more like a logical conclusion than a sequence of events.