Discusses many aspects of information pertainingto organism classification. Provides links to other areas in biology as well.

RCN offers information about plants, including the evolution and classification of different groups.

This page discusses how the cladistic level of classification includes information from molecular biology to establish evolutionary relationships. The page discusses how this information is used to do this.

Explore the classification of living things in this online, college-level textbook. Learn about taxonomy and its history through diagrams and descriptive information.

Use the scientific reasoning and critical thinking to take an in-depth look at the basics of biology.

Explore the evidence for evolution: anatomy, molecular biology, biogeography, fossils, & direct observation.

A lesson on the classification of mosses and liverworts as well as the physical make up and similarities of the species.

Quiz on some aspects of biological classification. Provides feedback when answers to the quiz are submitted.

Learn about viruses of humans and other animals, the Baltimore classification system, and the HIV life cycle.

An in-depth reference explaining the role of seed plants in biological diversity. Photographs and labeled diagrams help learners with understanding.

This is an advanced level review of cladistic theory and methodology. Some sections are very dense but there are useful sections for teachers and students seeking a better understanding of the topic.