Answer:
The biology mastery depend on studies at different scales, from the small to the very large because organisms that we study from micro scale micro-organisms to very large organisms such as elephants and whales.
When we talk about the subject biology it deals with all organisms that are present in this atmosphere, there are very diverse types and numbers of organisms ranging from a small microbe to a large mammal, hence mastering biology involves mastering all these organisms from micro to macro.