Estrella Mountain Community College
Online Biology Book: Biological Diversity: Protists: Stem Eukaryotes
Through full-color images and descriptive information, learn about the evolution of the eukaryotic organisms which eventually led to the presence of protists.
CK-12 Foundation
Ck 12: Biology: Earth Forms and Life Begins Study Guide
This comprehensive study guide covers the main terms and concepts needed for a unit on the origin of life.