Biology is a scientific discipline that explores the living world at all levels of complexity.
It ranges in its investigations from microscopic systems to systems extending into outer space, from interactions that occur almost instantaneously to interactions spanning billions of years. The tools of biological discovery are a few rigorous principles of scientific investigation, coupled with skills of mind that include creativity, skepticism, and discipline. Its purpose is to tease meaning out of the overwhelming confusion of living organisms that make the surface of this little planet such an interesting place to be. Many of the students who are interested in taking biology courses are looking toward prospective careers in medicine or related fields. Some want a better understanding of themselves, and their own biological nature.