1. Living Things: Structure and function of bones and skeletons, importance of skeletal movement, types of skeletons, role of medicines in combating infectious diseases. 2. Energy: Presence and forms of energy, energy transfer mechanisms, transformations between energy types, energy utilization in living organisms. 3. Materials: Composition and properties of substances, behavior of solids and liquids, processes of melting and solidification, fundamental principles of chemical reactions. 4. Earth and Its Habitats: Structure and layers of the Earth, formation and impact of volcanoes and earthquakes, diversity of habitats and their characteristics.