III. Read and understand each question below. Write the letter of the correct answer on the space provided. с 1. When is a material useful? a. When the material serves a purpose c. When the material hazards b. When the material brings harm 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 When the material gives other uses aside from its purpose. d When the material brings danger to people and environment 3. What happens to biodegradable waste when they are thown? a. Melts by the sun. c. Broken into pieces. b. Deceomposed by bacteria. d. Flattened. 4. Which of the following is a non-biodegradable waste? a. paper c. leaves b. rubber d. wood 5. Where do we place our garbage properly? a. in the river c. in the mountains b. in the landfills d. in the lakes​