Fare is a type of Passenger. Passenger is related to Helicopter. Helicopter is related to Pilot. you are likely to find Pilot in/at/on Airport. 
Ecological is a type of Biological. Biological is a synonym of Birth. Birth is the opposite of Die. 
Fare --IsA--> Passenger <--RelatedTo--> Helicopter <--RelatedTo--> Pilot --AtLocation--> Airport 
Ecological --IsA--> Biological <--Synonym--> Birth <--Antonym--> Die 