Charles Darwin was a famous biologist.

A biologist is a scientist who studies biology. Biologists study living organisms.There are many different kinds of biologists. Some of these include:

• Those who study fish and ocean plants. They are called marine biologists.
• Those who study very small bacteria or viruses.
• Other scientists study groups of animals.
• People who look at DNA in cells are called geneticists.
• Some biologists study using cells in factories and companies, and that is called biotechnology.