Scientists originally placed two species of fungus in the same genus because they looked very similar. New evidence later led scientists to move one species to a different genus.
Which explanation is most likely to account for this revision?
Improved microscopes revealed differences in their internal cell structures
Closer inspection showed that the two species differ slightly in colour
Later surveys found that one species is far more common than the other
One species was given a different common name in another country
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.