What term refers to something that is related to biology or living organisms?

The term "biological" specifically pertains to anything related to living organisms and their processes. This encompasses a wide range of subjects within the life sciences, including the study of cells, genetics, ecology, and physiology. When something is described as biological, it indicates a direct connection to the characteristics and functions of life.

The other terms, while related to different branches of science, do not capture the essence of living organisms in the same way. For instance, "chemical" relates to substances and their interactions, "physical" pertains to the properties of matter and energy, and "environmental" refers to the surrounding conditions and influences in natural settings. Each of these terms addresses distinct scientific aspects, making "biological" the most appropriate choice for describing matters specifically concerning living organisms.