Eating is related to Rest. Rest is related to Holiday. Holiday is related to Birthday. 
Immigration is a type of Migration. Migration is a type of Motion. Motion is a type of Energy. Energy is related to Science. 
Eating <--RelatedTo--> Rest <--RelatedTo--> Holiday <--RelatedTo--> Birthday 
Immigration --IsA--> Migration --IsA--> Motion --IsA--> Energy <--RelatedTo--> Science 