Kitty and I took the train from London to Paris, and from Paris to Barcelona.
- content/posts/2015/2015-12-23-london-to-barcelona-by-train/2015-12-23-london-to-barcelona-by-train-tickets.pdf
- Class (biology) (Wikipedia)
In biological classification, class (Latin: classis) is a taxonomic rank, as well as a taxonomic unit, a taxon, in that rank. It is a group of related taxonomic orders. Other well-known ranks in descending order of size are life, domain, kingdom, phylum, order, family, genus, and species, with class ranking between phylum and order.