This video is meant for NIOS students studying for CL12 exam. The video covers lesson on Principles of Ecology which is part of the module: Environment and Health. This video belongs to the book entitled Biology published by Gyaniversity for NIOS aspirants. This video has been curated by NIOS experts and presented to you within our guidebooks and courses. To make the best of your studies, check out guidebooks by Gyaniversity Publications and online courses by Gyaniversity Education.