The third session of the six health talk series was also organized by the School of Business on January 08, 2022, Saturday at 9:30 am on the Google meet platform. The speaker of the webinar was Prof. Dr. Mohammad Tariqur Rahman, Faculty of Dentistry, University Malaya, Jalan Universiti, KL 50603, Malaysia. In the third session, Mr. Rahman spoke on “DNA Replication & Repair, Body Defense Mechanism, and Immune System”. He discussed this particular issue elaborately through some points such as components, functions & factors affecting immunity, regenerating cells, the way of destroying microbiome and hijacking angiogenesis by cancers, innate and adaptive immunity, and figuring out the heavy-chain & light-chain genes. Professor Dr. ASM Shahabuddin, Dean, School of Business played the role of moderator in the seminar. More than 34 national and international participants were present in the seminar. The entire seminar was hosted by Assistant Professor Ms. Sonia Rezina, Department of Business Administration, School of Business, Uttara University.