11. Which of the following changes in the materials are harmful to the
environment?
A. Dumping of the garbage along the streets.
B. Throwing garbage properly.
C. Using paper bags when going to the market.
D. Reusing plastic containers.
12. When soil is polluted, which could be the result?
A. Growing of plants is not possible.
B. Plants get healthier.
C. Soil is rich in nutrients.
D. Water is safe for drinking.​