JAMB - Biology (1998 - No. 38)
The line that represents efficient recycling combined with stringent conservation is
IV
III
II
I
คำอธิบาย
The line that represents efficient recycling combined with stringent conservation is II. The reason being that as the mineral resources are being used up during the production process over time (i.e as time increases, from year to year), the depletion pattern of mineral resources over time remains constant ( the horizontal straight line).