In some countries, farmers add antibiotics to animal feed to prevent infections and to make the animals grow faster.
Discuss the use of antibiotics in animal feed.
In your answer, refer to the evolution of antibiotic-resistant bacteria.
44 exam-style questions on Edexcel GCSE Biology 4.1 Evolution and natural selection, covering 4.1.1 Work of Darwin and Wallace and 4.1.2 Resistant organisms and evolution. Each one has a worked solution and a mark scheme showing where the marks go.