In a similar pattern to #1576, but likely using [volume](http://purl.obolibrary.org/obo/PATO_0000918) as a superclass. These can be used to axiomatise many things, but most useful for "microorganism" and the like (xref microbial classes in #1568)
In a similar pattern to #1576, but likely using volume as a superclass.
These can be used to axiomatise many things, but most useful for "microorganism" and the like (xref microbial classes in #1568)