Describes the characteristics of Archaea, Bacteria, and Eukarya, the three domains of life.

[Free Registration/Login may be required to access all resource tools.] We have all heard of viruses. The flu, the common cold, and many other diseases are caused by viruses. But what is a virus? Do you think viruses are living? Which...

[Free Registration/Login may be required to access all resource tools.] Humans are in the same domain as trees and algae. What could they possibly have in common? It is the location of their DNA inside their cells. Their cells all have a...

[Free Registration/Login may be required to access all resource tools.] An overview of the evolution of prokaryotes.

Explore the three domains of life.