This paper is a reflection upon biology in Colombian schools, from the study of its history and, particularly, its emergence in 1900-1930.It can be seen that biology was not always a school subject matter.Its practice was restricted to repeating the methods and concepts of biologists -experts-, as well as those of biology as a science.From the analysis, you can state that the emergence of biology as a subject matter is related to concerns about illness, children's survival, the development of human body, the improvement of race, diet, and an increasing love for nature.From this perspective, the study states that events do not follow a continuum.For instance, it shows that natural history does not disappear when biology appears, since their objects of study at school are quite different.Furthermore, there is a reflection on its current teaching, taking into consideration that it might have been displaced by natural sciences.