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Chemistry IX | Matter-Its Nature and Behaviour | Part 1

Matter-Its Nature and Behaviour | Part 1 INTRODUCTION Matter · Anything that occupies space , possesses mass and exert pressure…

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Biology IX | Health and Diseases | Part 2

Health and Diseases | Part 2 Disease caused by bacteria Tuberculosis (T.B.) Tuberculosis (T.B.) was first discovered by Robert Koch…

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