you are likely to find Mushroom in/at/on Tree. Tree is related to Living. Living is related to Grow. 
Model is a type of Assistant. Instrument is a type of Assistant. Organ is a type of Instrument. Organ is related to Ear. 
Mushroom --AtLocation--> Tree <--RelatedTo--> Living <--RelatedTo--> Grow 
Model --IsA--> Assistant <--IsA-- Instrument <--IsA-- Organ <--RelatedTo--> Ear 