1.when is a material useful?
A. when the material serves a purpose
B. when the material brings ham
C. when the material hazards
D. when the material is toxic
2.when is a material harmful?
A. when the material can be used many times
B. when the material can be used in cooking
C.when the material gives other uses aside from it purpose
D. when the material brings danger to people and environment
3.what happens to biodegradable waste when they are thown?
A. melt by the sun
B. deceomposed by bacteria
C. broken into pieces
D.which of the following is a nor-biodegradable waste?
A. paper
B. rubber
C. leaves
D. wooc
5.where do we place our garbage properly
A. in the river
B. in the landfills
C.in the mountains
D. in the lakes​