These websites will help you learn more about your biology topics. They contain general information as well as advanced materials to help you discover material appropriate for your class.
Database of biological numbers. If you need to find out the number of hairs on the human head or the number of neurons in a mouse brain, this resource is an excellent place to look.
The world's leaders in biology present lectures that start with broad introductions and then progress to research questions and experiments.
National Science Foundation - Biological Sciences
In addition to descriptions of NSF biology research programs, this site provides science news and access to publications.
Tree of Life
Extensive information about organisms and their evolutionary history and taxonomy.
PLOS (Public Library of Science) is a nonprofit* publisher and advocacy organization with a mission of leading a transformation in scientific and medical research communication.