Club is related to Sandwich. Sandwich is related to Egg. Egg is related to Shape. Carve is a type of Shape. 
Biology is a different concept from Chemistry. Chemistry is related to Related. Related is related to Cross. Cross is related to Sign. 
Club <--RelatedTo--> Sandwich <--RelatedTo--> Egg <--RelatedTo--> Shape <--IsA-- Carve 
Biology <--DistinctFrom--> Chemistry <--RelatedTo--> Related <--RelatedTo--> Cross <--RelatedTo--> Sign 