Final answer:
Biology is the science that studies life and its shared properties. Defining life precisely is challenging due to its diversity and constant change. Biologists use eight key characteristics to define life.
Step-by-step explanation:
Biology is the science that studies life and seeks to define its shared properties. However, it is not always easy to precisely define life due to its diversity and complexity. Biologists have identified eight key characteristics that serve to define life, including order, sensitivity, reproduction, adaptation, growth and development, regulation, energy processing, and evolution.
One reason why it is difficult to develop a precise definition for life is that it is constantly changing. New organisms are discovered every day, and biologists continue to seek answers to questions about the origin and ongoing diversity of life. Additionally, some organisms, like viruses, exhibit some characteristics of living entities but do not meet all the criteria to be considered alive.