It may seem surprising, but a universal definition has not yet been found for "species" – the traditional basis of biological classification. And this is despite the fact that at various times more ...

Classification of neurons into types enables their reproducible identification across times, laboratories and conditions. Classification also facilitates genetic access for functional studies, as well ...

Micro-organisms constitute a very antique group of living organisms which appeared on the Earth's surface almost 3000 million years ago.

Taxonomy is the science that attempts to categorise the many millions of species on Earth. Find out how to define taxonomy, what taxonomists do and why classifying life is so important. The definition ...