IDNStudy.com, kung saan nagtatagpo ang mga tanong at sagot. Tuklasin ang malalim na sagot sa iyong mga tanong mula sa aming komunidad ng mga bihasang propesyonal.

Guide Questions: 1. From the activity 1 and 2, what are the materials that are useful and harmful? 2. What are the changes in the materials that are useful to the environment? What made them useful to the environment? 3. What are the changes in the materials that are harmful to the environment? What made them harmful to the environment?​