CK-12 Foundation
Ck 12: Biology: Evolution of Eukaryotes
[Free Registration/Login may be required to access all resource tools.] Discusses how eukaryotes evolved.
CK-12 Foundation
Ck 12: Earth Science: Evolution of Eukaryotes to Multicellular Life Study Guide
[Free Registration/Login may be required to access all resource tools.] Summarizes the key points about the evolution of eukaryotic cells into multicellular life forms. Includes a few questions to check for understanding.