Hellow guys, Welcome to my website, and you are watching Class 12th biology //कक्षा 12th विज्ञान//lesson 2// by np sir. and this vIdeo is uploaded by N.P COACHING CLASSES at 2025-12-15T15:23:57-08:00. We are pramote this video only for entertainment and educational perpose only. So, I hop you like our website.