Two cave-dwelling crustacean species were placed in different families because their body structures were different. Improved microscopes later revealed very similar structures inside their cells. DNA analysis also found many similarities between the species.
Which conclusion is best supported by the evidence?
The two species are probably less closely related than their family classification suggests.
The two species are probably more closely related than their family classification suggests.
The two species probably belong to different domains, as their body structures are very different.
The family classification is probably correct, as body structure is the main evidence used today.
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.