It is a matter of opinion, or of definition, whether viruses are considered ... All this is understandable in the light of evolution theory; but what a senseless operation it would have been ...

The questions in this quiz are suitable for GCSE biology students studying principles of evolution by natural selection, the work of Lamarck, Darwin's work on evolution, problems with evolution ...

and transitions between species mark the flow of evolution. But in fact, scientists and philosophers have debated for centuries the precise definition of a species. In high school biology we are ...