Online observation

Today i saw  https://www.youtube.com/watch?v=NHdZT_IPoV8&feature=youtu.be 

 1. Mendals, Genetics  Experiments:https://www.youtube.com/watch?v=NHdZT_IPoV8&feature=youtu.be

2.conductivity https://youtu.be/YMpK0xSQQ8M

3.environmental protection

https://youtu.be/WAI-hPRoBqs

WATCH VIDEO

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