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assamese medium biology ahsec biology class 12 ahsec biology chapter 16 biology ncert biology class 12 biology bioresources of assam bioresources assamese note biology microbes in human welfare microbes ncert class 12 biology class 12 biology chapter 10 hurberium hnsa characteristics of living organism plant kingdom zoological park biodiversity phylum kingdom species genus scientific name linnaeus nomenclature first year biology note biology the living world note the living world class 11 biology class xi living cell organelle plant cell eukaryotic the cell cell prokaryotic cell sem image electron microschope cell discovery cell theory nobel prize physiology or medicine 1901-2014 history