10.12. 4.B

 

1. http://learningapps.org/display?v=p02fmuvct16

2. http://learningapps.org/display?v=pb7bwi7aa16

3. http://learningapps.org/display?v=pnhbt79b516

4.  https://learningapps.org/display?v=pfhrshcsc20

5. https://learningapps.org/display?v=p4st4d0d221

6. https://learningapps.org/display?v=p87e96v5321