The prefix bio means which of the following?

• A. Immature cell
• B. Arm
• C. Life
• D. Hear

Answer: (C)

The main idea here is understanding common prefixes that describe biology and life. The prefix bio- means life or living organisms, which is why it appears in words like biology (the study of life), biography (a life story), and biosphere (the regions of Earth where life exists). That makes bio- the best answer for the meaning of this prefix. The other options point to different roots—for example, a term meaning immature cell would use a root like blast-, a term for arm would use brachi- or brachio-, and a term for hear would use oto- or acoust-. Those do not match bio-, which is all about life.