What does biology mean to humans?
Biology is simpy the study of organisms (animals, plants, bacteria,viruses,funghi etc.) and by extension nature itself. Smallpox is a disease that affects only humans and is deadly, covering the victim in rashes and blisters that can cause blindness and limb deformities. And so by studying humans and the causes and effects of smallpox on them, one is studying biology.
The benefits of biology are endless. Through biology humans have discovered the basic units of life and how something as complex as a multicellular organism works. Without biology, medical institutions we have today would not be as advanced, as we would lack the necessary knowledge to interpret the human body.