Water has a special significance in the development of living organisms, as life began in the primordial oceans of early planet Earth. 

The first chapter discusses the definition of life and the smallest basic unit of all living organisms: the cell. 

The chapter The significance of water discusses water's significance in sustaining life on Earth and outlines the basic features of water and its circulation. 

The chapter The study of nature functions as a small guide to the study of nature. The included instructions allow the student to conduct various kinds of biological studies. Finished reports and photos can be returned to folders found in the Excercises section.