The word biology is derived from the greek words /bios/ meaning /life/ and /logos/ meaning /study/ and is defined as the science of life and living organisms. An organism is a living entity consisting of one cell e.g. bacteria, or several cells e.g. animals, plants and fungi.
What are the 4 types of biology?
   Science Based On Organisms
   This division focuses on the study of individual branches of life.
   There are four primary categories: botany, human biology, microbiology  
    and zoology.

Who is father of biology?
  Aristotle
      Aristotle: Aristotle is regarded as the Father of Biology. He is also regarded as the    Father of Zoology. He started classification with two kingdoms Animal and Plantae.
Importance of Biology
It is obvious why biology is important for studying medicine: biology is the foundation. It is a field of biology that examines how living things like humans function. Biology is still far from having all of the solutions that scientists need.
Despite recent technical advances, the origin of life on Earth continues to be one of man’s biggest mysteries. With an estimated 8.7 million species on the Earth, and just 1.9 million of them have been discovered, there are an infinite amount of species to study in biology.
Biology occurs every second when people breathe in and out; each cell receives oxygenated blood and releases carbon dioxide. How do our hearts function and work so hard? What variations exist in how people perceive things? What exactly is awareness? Biology can help in the search for solutions to these questions.
However, biology also has to deal with other living things than humans. By examining how it works, scientists can identify potential threats to the environment and explore more environmentally friendly solutions.