https://youtu.be/TEhEAkH6dYE
2.easy method to draw digestive system
https://youtu.be/29nYBjTZZTQ
3.respiration in humans
https://youtu.be/I-yJtGOVgw0
4.circulatory system in humans
https://youtu.be/8M8nExdtdMY
5.easy method to draw heart
https://youtu.be/IWW39ds2eKk
6.easy methods to draw nephron
https://youtu.be/SE6VSI2Lozs
7.excretory system
https://youtu.be/noWoULdwYXI
8.cross section of leaf
https://youtu.be/5V1DTmbLt4E
9.opening and closing of stomata
https://youtu.be/1T6LPhtl_zc
10.Translocation
https://youtu.be/1T6LPhtl_zc
11.Ascent of SAP
https://youtu.be/mGTYeaiXgGg
12.Photosynthesis
https://youtu.be/yPMmWKoet_s
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