Biology
What is biology? Simply stated: Biology is the study of life and the changes that take place with and around all living things. The study of life is not just the study of the living organisms on Earth. Biology covers every planet and object in the Universe.
Just like everything on Earth is made of atoms, Everything that is alive on Earth is made of cells. An entire living thing can be one cell or it can be billions. Most cells on Earth have similar pieces and parts.