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 "Apply understanding of diffusion to explain and interpret GCSE Biology exam questions." 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 438c80 to keep the explanation distinct. Variant 201 checks written explanation rather than multiple-choice recognition.