See how the discovery of DNA in 1953 sparked a new era of research into the code of life. [1:40]

This comprehensive article provides information about the physical properties of water, the importance of water as an Earth material, the processes and cycles that water undergoes on Earth, its importance to life on Earth, and why we...

Learn how basic elements form molecules to support life.

This video segment, adapted from the Interactive Secret of Life videodisc, explains the stages of mitosis, the process of dividing equally a cell's massive jumble of DNA just prior to cell division. [1:34]

Understand the processes of osmosis and diffusion.

Online biology textbook discussing the chemical nature of water, and the importance of its molecular structure to life. Also discusses at length the organic molecules nucleic acids, proteins, lipids, and carbohydrates.