CK-12 Foundation
Ck 12: Episd: Classification of Plants
[Free Registration/Login may be required to access all resource tools.] Identify and understand the system used to classify plants and the difference between vascular and nonvascular plants.
CK-12 Foundation
Ck 12: Life Science: Organization of Living Things
[Free Registration/Login may be required to access all resource tools.] When you see an organism that you have never seen before, you probably put it into a group without even thinking. If it is green and leafy, you probably call it a...
Open Curriculum
Open Curriculum: New Kingdoms
Between 1866 and 1977, a total of four new kingdoms were added to the original plant and animal kingdoms identified by Linnaeus. The new kingdoms include Protista (protists), Fungi, Monera (eubacteria), and Archaea (archaebacteria)....
The Franklin Institute
The Franklin Institute: Living Things Families
What do centipedes and crabs have in common? What's so special about a backbone? Check this site out from The Franklin Institute if you are interested in biology and classification.
Other
The Domains and Kingdoms of Life
This site is a description of the history behind the 5 Kingdom system suggested by Robert Whittaker. An extensive list of resources is included.