Bio-physics is such a branch of science which is developed on the basis of a number of branches of science. Theories and methods of physical science are employed in biophysics to study a system of biology. Biology is the science of studying living world. How plants and animals collect food, communicate, percept from the environment and reproduce are discussed in biology. On the other hand the mathematical rule which nature follows is the subject-matter of physics. For a long period, the scientists believed that the laws of living world and physical world are different. But with the progress of physical and biological science, a deep harmony is found between these two apparently different disciplines. At first physics and biology has evolved as two different subjects.
The mutual relationship and coordination between these two subjects has increased a lot with the advancement of science. It was thought before that living world follows a different rule and the laws of physical science are applicable only for the inanimate objects. But now we know that the animal body can be compared to a machine from many aspects and it is possible to explain many behaviors of animal body with the help of physical laws. Actually, the laws of physics are universal. So, not only the physical world, but also the animal kingdom can be explained with the help of physics in many cases. This is the basis of bio-physics.
The challenge of bio-physics is to explain different complexities of life on the basis of simple laws of physics. Bio-physics is a powerful tool to reach at the depth of life by investigating different secrets of life and analyzing different events using mathematics and physics. Bio-physics is a bridge between biology and physics.