Learn about cell theory in this article. [12:29]

This module focuses on cell structure and how the organelles function together to form the smallest unit of life. The cell theory is also discussed along with the basics features of the cell. Site also includes an interactive practice...

Explanation of when the cell was discovered and how ideas have evolved into modern cell theory. Discover the cell structures and their functions.

Through full-color images and concise information, learn about the origin of cells. Discover some of the notable studies surrounding the history of life on Earth.

Use the scientific reasoning and critical thinking to take an in-depth look at the basics of biology.

Discusses natural selection and explains this theory in detail in reference to the evolution of the peppered moth. Discusses how the forces of natural selection lead to other kinds of speciation and evolutionary processes.