H.S. Science Class is a course offered in high school that covers the three main branches of science: Chemistry, Biology, and Biology. Chemistry is the study of matter and its properties, as well as the changes it undergoes. Biology is the study of living organisms, their structure, function, growth, origin, evolution, and distribution. Biol is an abbreviation for Biology, which is the study of life and living organisms. All three of these subjects are essential components of a high school science class.