"Singing is the oldest, most effective and productive way to tackle girls," asserted the 37-year old, affectionately known as Ah Guan at Tan Chang Ren Music Station.
Potholes or sloughs formed by a glacier’s retreat from the central plains of North America, are now known to be some of the world’s most productive ecosystems.
Meaning of productive for the defined word.
Grammatically, this word "productive" is an adjective.