Cures and medicines for diseases, such as diabetes, can be credited to the study of

Biology.

The science of biology is a systematic and organized body of delving into and about life.
Anything that has life.

Studying life, animals, plants, protists and the interactions.
A biological system or also called, a biotic community is composed mainly of living organisms. These organisms can be classified into the main layman categories of animals and plants, majorly. These creatures can be more furthered classified by how they eat and survive. Plants can make their own food through, photosynthesis. Animals eat and are dependent. Can be classified into subtypes as: herbivores, omnivores and carnivores. What makes all of these organisms a biotic community or a biological system is they contain cells, cells are the basic unit and foundation of every living thing.