1. Human body and skeleton: skull protects brain, ribs protect lungs, elbow is a joint in the arm, joints allow movement, bones provide protection and structure 2. States of matter and changes: melting and freezing as phase changes, solids (iron, silver), gases (carbon dioxide, hydrogen), properties of solids, liquids, gases, liquids flow and take shape of container, gases compress easily, sound cannot travel through a vacuum 3. Sound and vibration: sound made by vibrations (e.g. lips, balloon), sound travels through solids, liquids, gases, not vacuum, pitch affected by water level, louder or quieter sounds based on material, investigation of materials blocking sound 4. Health, medicine, and sequences: liquid medicine for babies for ease of swallowing, treatment steps (fever → doctor → medicine → recovery), syringe use for delivering medicine, temperature returns to normal after treatment 5. Investigations and measurements: fair testing in experiments (same time under leaves/log), using balance and ruler to measure mass and length, interpreting results from woodlice experiment, ruler for distance, thermometer for temperature, sound level meter for volume, interpreting bar charts and keys 6. Classification and identification: using branching keys to identify animals (legs, wings, shell, length), woodlice habitat preferences (prefer dark, damp places), more found under logs, conclusion from comparison, Dermanyssus, Papilio, Scolopendra identification based on features