Biology is the scientific study of life and living organisms. It examines how organisms are structured, how they function, grow, reproduce, evolve, interact with one another, and respond to their environment.

Biology studies life at many levels—from molecules, genes, and cells to whole organisms, populations, ecosystems, and the biosphere.

Simple Definition

Biology is the science of life. It studies living organisms, their structures, functions, development, evolution, and relationships with the environment.

The word Biology comes from two Greek words:

• Bios = Life
• Logos = Study or knowledge

Therefore, biology literally means the study of life.