Organisms used to be classified into five kingdoms: animals, plants, fungi, protists and prokaryotes.
Scientists now suggest that organisms should be classified into three domains.
Explain how genetic analysis has led to the suggestion of the three domain system rather than the five kingdom system.
40 exam-style questions on Edexcel GCSE Biology 4.2 Evidence for evolution and classification, covering 4.2.1 Fossil evidence for human evolution, 4.2.2 Stone tool evidence for human evolution, 4.2.3 Pentadactyl limb as evidence, and 4.2.4 Three domains classification. Each one has a worked solution and a mark scheme showing where the marks go.