Part (ii) (ii) Why are certain substances non bio-degradable? Share with your friends Share 0 Rishabh Mittal answered this Dear Student , Refer the following link : https://www.meritnation.com/cbse-class-10/science/science-ncert-solutions/our-environment/ncert-solutions/12_2_1321_159_257_929 We hope the above link will help you in clearing the doubt . Regards 0 View Full Answer