Which pair of features is found in an effective exchange surface in an animal?
A large surface area and a thick membrane
A large surface area and a thin membrane
A small surface area and a thick membrane
A small surface area and a thin membrane
140 exam-style questions on AQA GCSE Biology 1.3 Transport in cells, covering 1.3.1 Diffusion, 1.3.2 Osmosis, and 1.3.3 Active transport. Each one has a worked solution and a mark scheme showing where the marks go.