The world of concepts is far from the world of definitions, the main diference is that concepts are made to the world to understand, and definition is a statical not contradictable. So, if the characteristics, states and details doesn't match perfectly to a definition it will certainly not be it; although could be use as it for the common understand, but still will be wrong. Defining science: Science is the study of the real things throu the cientific method. The scientific method steps are: Observation Hypothesis Experiment Collect data Conclusion Law So in order to a science be considered as such should follow all these steps with no exception. Another caracteristic of the sciences is that they do not contradict, but complement. Biology doesn't build law, nor objective definitions. And doesn't follow all the steps of the scientific method. Another thing is that the "parts" belived to belong to biology that follow scientific method actually are parts of the chemistry, like biochemistry that tries about the process and sintesis of proteins. (advanced organic chemistry) Biology contradicts, like the " life self generation " the one than a chemister Louis Pasteur with a true science Chemistry beat that "theory". Another example was the statement that only organic products could be generated by living things and another chemister came to save the world from ignorance Wöhler. And such there are plenty examples of things like this. The only sciences i really do recognize are chemistry and physics. (mathematics are tools, such as statistics so that biology use probability to make itself as a science its incorrect because it´s only probability.) and for genetics, at the very end will end to be more chemistry than biology. (When the quantum theories get to be theory (some of them are still hypothesis yet) we will understand the intermolecular forces will does the moleculas form in which way and why (with mathematical equations) we will be able to calculate the permutations of all the molecules that can ever exist and in which situations it's posible than even chemistry will disappear as a formal science and become part of physics. and it will end at a lot of physics and a lot of mathematics.) But actually biology cannot take place of a science, just as the collection of characteristics and subjective groups of the living beings. (like a big familiar album). What do you think?