Habitat is a type of Environment. Environment is related to Pollution. you are likely to find Pollution in/at/on Outside. Outside is the opposite of Room. 
Constitute is a synonym of Represent. Represent is related to Speak. Spokesman is etymologically related to Speak. 
Habitat --IsA--> Environment <--RelatedTo--> Pollution --AtLocation--> Outside <--Antonym--> Room 
Constitute <--Synonym--> Represent <--RelatedTo--> Speak <--EtymologicallyRelatedTo-- Spokesman 