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neet cbse biology classxii ncert health diseases ecology human food production breeding strategy animals food crops single cell proteins sexual reproduction endocrinology application microbiology class xii pathogens abuse alcohol drugs cancer aids development immunology fertilization anatomy physiology science parturition lactation biodiversity ecosystem services nutrient cycle ecological successions ecological pyramids nutrient cycling energy flow decomposition productivity ecosystem conservation patterns of biodiversity importance of biodiversity loss of biodiversity conservation of biodiversity conservation stratgies botany welfare