There are many interactions among living things and their surroundings. By completing a reading, scholars learn about the Earth, the moon, and the sun and how they relate to the solar system. They also investigate the basics of physical...

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.

This resource is an article about the cell membrane, and its role in water and solute movement in and out of the cell.