Describe one way a GCSE Biology question could test diffusion in Diffusion.

The question could ask for a definition, explanation, comparison, practical interpretation, or application depending on the wording of the objective.

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 aa677f to keep the explanation distinct. Variant 194 checks written explanation rather than multiple-choice recognition.