Which word contains the root 'bio' meaning life?

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Recognizing word parts helps you deduce meaning. The part bio- means life, so a word that includes bio- is about living things. Biology literally means the science of life, so it contains that life-related root. The other options rely on different roots: geo- refers to earth in geography, chem- relates to chemicals in chemistry, and hist- relates to past events or inquiry in history. Since only biology carries the root meaning life, the word that contains bio is biology.