Penicillin, the first antibiotic, was discovered by Alexander Fleming in 1928. He saw that a mold killed bacteria in a petri dish. This discovery changed medicine and saved millions of lives worldwide. class 8 science chapter 3 health the ultimate treasure ...
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Yes, COVID-19 is a communicable disease caused by the coronavirus. It spreads through cough, sneeze or contact. It caused a global pandemic and people were advised to wear masks and maintain distance. Class 8 Science Grade 8 Chapter 3 Health: The ...