Ecosystem is related to Desert. Desert is related to Like. Like is related to Material. Material is related to Grain. 
Relate is a type of Interact. Connect is a type of Relate. 
Ecosystem <--RelatedTo--> Desert <--RelatedTo--> Like <--RelatedTo--> Material <--RelatedTo--> Grain 
Interact <--IsA-- Relate <--IsA-- Connect 