Habitat is a type of Company. Company is related to Structure. Tube is a type of Structure. Tube is a type of Supply. 
Anxious is a synonym of Nervous. Nervous is related to Animal. Animal is related to Cow. 
Habitat --IsA--> Company <--RelatedTo--> Structure <--IsA-- Tube --IsA--> Supply 
Anxious <--Synonym--> Nervous <--RelatedTo--> Animal <--RelatedTo--> Cow 