https://www.khanacademy.org/science/od-class-6-science-bridge-course/x2aff4c1317c56c62:living-and-non-living/x2aff4c1317c56c62:characteristics-of-living-beings/v/useful-and-harmful-living-things 2025-01-27T07:36:54.139191702Z Useful and Harmful Living Things Learn how plants provide food and medicine, and how animals help with daily tasks, food, and clothing. Explore the impact of harmful microorganisms, poisonous plants, and dangerous animals, including wild ones. Joel Prakash Stephen video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Useful and Harmful Living Things Learn how plants provide food and medicine, and how animals help with daily tasks, food, and clothing. Explore the impact of harmful microorganisms, poisonous plants, and dangerous animals, including wild ones. https://cdn.kastatic.org/ka-youtube-converted/CnyWFz2xNuk.mp4/CnyWFz2xNuk.mp4 266 General introduction and classification of microorganisms https://www.khanacademy.org/science/mh-grade-9-bridge-course-science/x109ad1e366099af5:living-world-and-classificaiton-of-microbes/x109ad1e366099af5:classification-of-microorganisms/v/friend-or-foe-understanding-microorganism-middle-school-science-khan-academy 2025-01-08T02:29:38.725066879Z Microorganisms: Friend or Foe? Learn how helpful microorganisms contribute to soil fertility, food production, antibiotics, vaccines, and even environmental cleanup. At the same time, discover how harmful microorganisms can spoil food and cause diseases. Shankar Nair video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Microorganisms: Friend or Foe? Learn how helpful microorganisms contribute to soil fertility, food production, antibiotics, vaccines, and even environmental cleanup. At the same time, discover how harmful microorganisms can spoil food and cause diseases. https://cdn.kastatic.org/ka-youtube-converted/LqL492kifkU.mp4/LqL492kifkU.mp4 372 General introduction and classification of microorganisms https://www.khanacademy.org/science/revision-term-2-tg-biology-class-8/x04828215b460a495:week-2/x04828215b460a495:the-world-of-microorganisms-part-i-ii/e/lo-5-1-micro-organisms-fundamentals 2026-04-06T02:41:58.374508961Z Micro-organisms (Fundamentals) Let's solve some problems to better understands some fundamental properties of micro-organisms. Aakash Bagga exercise https://www.khanacademy.org/science/revision-term-2-tg-biology-class-8/x04828215b460a495:week-2/x04828215b460a495:the-world-of-microorganisms-part-i-ii/e/lo-5-2-diseases-caused-by-microorganisms 2026-04-07T22:23:57.656416987Z Diseases caused by microorganisms Let's solve some problems to better understand what are the diseases caused by microorganisms Aakash Bagga exercise https://www.khanacademy.org/science/telangana-class-8-biology/x9e658c120b0ca797:the-world-of-mico/x9e658c120b0ca797:vaccine/v/vaccination 2025-10-01T17:00:46.216593062Z Vaccination In this video we will learn about the history of vaccines with Edward Jenner and smallpox, the immune system’s defence mechanism, antigens, antibodies, and memory cells. We will explore the difference between vaccine and vaccination, and explore common vaccines like Polio, BCG, MMR, DPT, Hepatitis, and Chickenpox. This video explains the mechanism of vaccination, immune response, and preventive medicine in a clear and simple way. Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Vaccination In this video we will learn about the history of vaccines with Edward Jenner and smallpox, the immune system’s defence mechanism, antigens, antibodies, and memory cells. We will explore the difference between vaccine and vaccination, and explore common vaccines like Polio, BCG, MMR, DPT, Hepatitis, and Chickenpox. This video explains the mechanism of vaccination, immune response, and preventive medicine in a clear and simple way. https://cdn.kastatic.org/ka-youtube-converted/z-eZnk1__ZY.mp4/z-eZnk1__ZY.mp4 581 General introduction and classification of microorganisms https://www.khanacademy.org/science/telangana-class-8-biology/x9e658c120b0ca797:the-world-of-mico/x9e658c120b0ca797:vaccine/e/lo-5-3-vaccination 2026-03-24T23:41:07.080866137Z Vaccination, Uses of micro-organisms and Vaccination chart Let's solve some problems to better understand the concept of vaccination and its uses. Aakash Bagga exercise