Classification

The idea

Linnaeus classified living things into kingdom, phylum, class, order, family, genus and species, and gave each a binomial name (genus and species, such as Homo sapiens). New evidence from microscopes and biochemistry led Carl Woese to propose a three-domain system: archaea, bacteria and eukaryota. Evolutionary trees show how closely organisms are related.

1. Order the Linnaean ranks.
2. Write a binomial name.
3. Name the three domains.

Watch out Two organisms in the same genus are more closely related than two in the same family only.