Strange beasties
In the hierarchy of life on planet Earth there are three domains. These are, the Eukaryota, Bacteria and Archaea. The Eukaryota comprise all the life around you that can be seen with the naked eye1. They are characterised by each cell having a nucleus and other membrane-surrounded organelles (e.g. Mitochondria, Chloroplasts). Bacteria and Archaea do not have nuclei.