Unhappy is a synonym of Low. Low is related to Distance. Distance is related to Closer. 
Child is related to Nature. Nature is related to Wildlife. Wildlife is related to Preserve. Preserve is related to Intact. 
Unhappy <--Synonym--> Low <--RelatedTo--> Distance <--RelatedTo--> Closer 
Child <--RelatedTo--> Nature <--RelatedTo--> Wildlife <--RelatedTo--> Preserve <--RelatedTo--> Intact 