This document introduces the branches of science, with a focus on life science. It lists life science as a branch and identifies some of its sub-branches, including botany, zoology, microbiology, biotechnology, biochemistry, environmental science, agricultural science, agrochemical and pest management, bioinformatics, environmental biotechnology, ecology, evolution, and genetics. It also outlines some common paths of study in life science, including undergraduate, masters, PhD, and postdoctoral degrees. Finally, it lists some of the major exams relevant to teaching and research careers in life science.