ecology and environment playlist👇 https://youtube.com/playlist?list=PLq8o8aMm-CRn_eEYYADsDmlPo2jPKQXBy&si=Rk_cETVOsQZ8y9pe pdf 👇 https://drive.google.com/file/d/1OYHkoGAZH1ZEV285mdtZZop1PyWbceMA/view?usp=drivesdk