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INSTRUCTIONS FOR USE OF THE BOOK Opening Lesson 1: Introduction to natural science. LESSON 2: Major areas of the natural sciences LESSON 3: Safety regulations in the practice room. Introduction to measuring instruments - Using a magnifying glass and an optical microscope Topic 1: Measurements LESSON 4: Measuring length LESSON 5: Measuring mass LESSON 6: Measuring time LESSON 7: Celsius temperature scale . Measuring temperature Topic 2: Forms of matter 35 LESSON 8: Diversity and basic bodies of matter. Properties of substances Topic 3: Oxygen and air LESSON 9: Oxygen LESSON 10: Air and air environment protection Topic 4: Some common materials, fuels, raw materials, food - food: Their properties and applications LESSON 11: Some common materials LESSON 12: Fuel and energy security LESSON 13: Some materials LESSON 14: Some foods - foods Topic 5: Pure substances - Mixture. Methods to separate substances LESSON 15: Pure substances - Mixtures LESSON 16: Some methods of separating substances from mixtures Topic 6: Cells - The basic unit of life LESSON 17: Cells LESSON 18: Food Observation of biological cells Topic 7: From cell to organism LESSON 19: Single-celled and multicellular organism LESSON 20: Levels of organization in multicellular organisms LESSON 21: Practice observing biology Animals Topic 8: Diversity of living worlds LESSON 22: Classification of living worlds LESSON 23: Practice building dichotomous keys LESSON 24: Viruses LESSON 25: Bacteria LESSON 26: Practice observing bacteria. Learn the steps to make yogurt LESSON 27: Protozoa LESSON 28: Mushrooms. LESSON 29: Plants LESSON 30: Practice classifying plants LESSON 31: Animals. LESSON 32: Practice observing and classifying animals in the wild LESSON 33: Biodiversity LESSON 34: Understanding creatures in the wild Topic 9: Force LESSON 35: Force and force representation LESSON 36: Effects of force LESSON 37: Gravity and weight 163 LESSON 38: Contact forces and non-contact forces LESSON 39: Deformation of springs. Force measurement LESSON 40: Friction Topic 10: Energy and life LESSON 41: Energy LESSON 42: Conservation of energy and use of energy Topic 11: Earth and sky LESSON 43: Vision vision of the Sun LESSON 44: Visible motion of the Moon LESSON 45: The Solar System and the Milky Way Terminology Explained