In this essential GCSE Biology episode, Miss Sarah Blake explores the fascinating hierarchy of biological organisation, from the smallest cellular components to complex ecosystems. Students will discover how cells form tissues, tissues create organs, organs build systems, and systems work together in complete organisms. This comprehensive guide covers organelles, multicellular organisation, organ systems, populations, communities, and ecosystems, making it perfect for GCSE Biology revision. Learn why biological hierarchy matters for understanding life processes, evolution, and ecological relationships. Essential topics include cell structure, tissue types, organ function, and system integration. This episode helps students connect concepts across different biological scales, preparing them for exam questions on organisation and specialisation. Perfect for understanding how structure relates to function in living organisms. Key terms covered include organelles, tissues, organs, systems, organisms, populations, communities, ecosystems, specialisation, and biological hierarchy. Students will gain crucial insights into how life is organised at every level, from molecular to ecological scales, supporting their understanding of other GCSE Biology topics.