Which combining form indicates life or living organism?

• A. phot/o
• B. cheil/o
• C. bi/o
• D. ren/o

Answer: (C)

Bi/o is the combining form that indicates life or living organisms. It comes from the Greek bios meaning life and is used in terms about living things, such as biology, the study of life. In medical terminology, bi/o combines with suffixes and other word parts to form life-related terms, distinguishing it from others that refer to light (phot/o), lip (cheil/o), or kidney (ren/o).