Explain how diffusion links to this AQA GCSE Biology objective: describe the key ideas and required knowledge in diffusion for AQA GCSE Biology 8461.

A strong answer should state the relevant biological idea, explain how it works in Diffusion, and link it directly to Transport in cells.

This exam-style response should address "Describe the key ideas and required knowledge in diffusion for AQA GCSE Biology 8461." by naming the key biological idea, explaining how it works in Diffusion, and linking it back to Transport in cells. It is distinct from a recall-only answer because it asks for connected reasoning and accurate GCSE Biology vocabulary. This version focuses on Diffusion within Transport in cells and uses the question reference c708da to keep the explanation distinct. Variant 193 checks written explanation rather than multiple-choice recognition.