Ecological is a type of Biological. Biological is a synonym of Natural. 
Discover is a synonym of Uncover. Uncover is a synonym of Strip. Strip is a type of Part. Part is related to Afternoon. 
Ecological --IsA--> Biological <--Synonym--> Natural 
Discover <--Synonym--> Uncover <--Synonym--> Strip --IsA--> Part <--RelatedTo--> Afternoon 