Here's a breakdown:

* Bio- refers to life.

* -logist indicates someone who studies or specializes in a particular subject.

Biologists can specialize in various fields, such as:

* Botany: Study of plants

* Zoology: Study of animals

* Microbiology: Study of microorganisms

* Ecology: Study of interactions between organisms and their environment

* Genetics: Study of genes and heredity

* Physiology: Study of the functions of living organisms

* Evolutionary Biology: Study of the origin and evolution of life

Biologists use a wide range of scientific methods and tools to study living organisms, including:

* Observation: Careful and detailed observation of living organisms in their natural environment or in a laboratory setting.

* Experimentation: Controlled experiments to test hypotheses about living organisms.

* Molecular Biology: Techniques that allow the study of DNA, RNA, and proteins.

* Bioinformatics: Use of computer tools to analyze biological data.

Overall, biologists play a vital role in understanding the natural world and developing solutions to challenges facing our planet, such as environmental conservation, food security, and disease prevention.