What do you call a scientist who studies living organisms?

A scientist who studies living organisms is referred to as a biologist. Biologists focus on understanding the structure, function, growth, evolution, and distribution of living things. This field encompasses a wide range of sub-disciplines, including microbiology, zoology, botany, and ecology, allowing for an in-depth exploration of various aspects of life.

While ecologists study relationships between living organisms and their environments, and biochemists examine the chemical processes that occur within living organisms, the term biologist broadly encompasses all these areas of study related to living organisms. Geologists, on the other hand, focus on the Earth, its structure, and the processes that shape it, which do not fall under the study of living organisms. Thus, biologist is the most accurate term for someone whose primary focus is on living organisms.