eco subset
has part
has_part
has part
composed primarily of
RO:0002473
composed_primarily_of
composed_primarily_of
uberon
x composed_primarily_of y iff: more than half of the mass of x is made from parts of y
'otolith organ' SubClassOf 'composed primarily of' some 'calcium carbonate'
x composed_primarily_of y if and only if more than half of the mass of x is made from y or units of the same type as y.
Chris Mungall
material entity
axiom holds for all times