A career in medicine is surely one of the most noble callings available to us. It undoubtedly involves a sacrifice in terms of the considerable amount time spent studying and a (potentially) significant financial outlay to get qualified, but once you have earned your spurs you will enjoy a well-compensated career, improving people's lives while gaining the sort of respect and reverence that is afforded to only a few vocations.
Life science is a rapidly evolving field that aims to answer some of the most fundamental questions on how we live, where we live, and how we might live better. It includes the study of plants, animals, viruses, bacteria, single-celled organisms, and even cells. There are more than thirty different branches of life sciences including Zoology, Botany, Ecology, Entomology, Cell Biology, Microbiology, Genetics, Physiology, Paleontology, Marine Biology and Epidemiology.
A compelling reason to go into life science is the sheer breadth of study it offers. As the field is so broad, given that it covers the study of every living thing in the universe, past and present, so the chances are good that you'll be able to find a specific area that catches your interest.