4.4 Water Pollution - Eutrophication (DO and BOD)

[@tomirisaitzhanova6892]

Thank you so much for your "online lessons"! Your explanations are the best!

[@joebiben3500]

This and a blunt 💯💯

[@danielrus7117]

Thank you!

[@acedelizo6430]

Nice video

[@kumarvermakri]

Please can I ask more??

[@mememan9061]

nice gasp