Which observation provides evidence that bacteria have evolved resistance to an antibiotic?
Descendants die at a concentration that killed the original population.
Descendants survive a concentration that killed the original population.
Original bacteria grow faster when supplied with extra nutrients.
Original bacteria grow slower when kept at lower temperatures.
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.