Life is only an idea.
Life . Various forms of life exist , such as plants , animals , fungi , protists , archaea , and bacteria . Biology is the primary science concerned with the study of life , although many other sciences are involved . Cells are sometimes considered the smallest units and `` building blocks '' of life . Death is the permanent termination of all biological functions which sustain an organism , and as such , is the end of its life . is a shōjo manga series created by Keiko Suenobu , a manga creator well known for her work on Vitamin and Happy Tomorrow .