CK-12 Foundation
Ck 12: Organization of Living Things
[Free Registration/Login may be required to access all resource tools.] This lesson explains the levels of organization within the biological world. It looks at the cell to organism hierarchy, and at the population to biosphere...
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Math and Science Activity Center: Classification of Living Things
Kingdom is the highest rank used in the biological taxonomy of all organisms. There are 6 kingdoms in taxonomy. Every living thing comes under one of these 6 kingdoms. The six kingdoms are Eubacteria, Archae, Protista, Fungi, Plantae,...