Practise Edexcel GCSE Biology 4.1 Evolution and natural selection with exam-style questions for Foundation and Higher tier. 50 questions covering 4.1.1 Work of Darwin and Wallace and 4.1.2 Resistant organisms and evolution, matched to the Edexcel GCSE Biology (1BI0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.