https://www.khanacademy.org/science/biology/biology-of-viruses/virus-biology/v/viruses 2021-03-18T10:33:24Z Viruses Introduction to viruses. Sal Khan video https://cdn.kastatic.org/googleusercontent/Y2goQonuPymd0AbVnv5A_J2p_tFV9xQOSXJSE3jjI24wWdtWF6HSQLnL064BIg4AnlgVzV1kDhSu5XwzA6C22hY Viruses Introduction to viruses. https://cdn.kastatic.org/ka-youtube-converted/0h5Jd7sgQWY.mp4/0h5Jd7sgQWY.mp4 1397 Parasitic nature of viruses