Organism is part of Ecosystem. Ecosystem is a type of System. Economy is a type of System. Economy is related to Money. 
Exercise is related to Training. Training is related to Course. Course is related to Dinner. you are likely to find Corn in/at/on Dinner. 
Organism --PartOf--> Ecosystem --IsA--> System <--IsA-- Economy <--RelatedTo--> Money 
Exercise <--RelatedTo--> Training <--RelatedTo--> Course <--RelatedTo--> Dinner <--AtLocation-- Corn 