Scientists construct an evolutionary tree containing living animals P and Q and extinct animal R. Only fossilised bones of R are available; no DNA has been recovered.
Which comparison could help place all three animals on the tree?
Compare their bone structures, then use classification data for P and Q.
Compare their DNA sequences, then use classification data for P and Q.
Compare their bone structures, then use living population sizes for P and Q.
Compare their DNA sequences, then use living population sizes for P and Q.
81 exam-style questions on AQA GCSE Biology 6.4 Classification of living organisms, covering 6.4 Classification of living organisms. Each one has a worked solution and a mark scheme showing where the marks go.