In biological terminology, the root "spir/o" most commonly refers to which of the following?

• A. Digestion
• B. Breathing or respiration
• C. Cell division
• D. Movement

Answer: (B)

Verified step by step guidance

1. Step 1: Begin by analyzing the root 'spir/o' in the context of biological terminology. Roots in biology often provide clues about the function or process they describe.
2. Step 2: Recall that 'spir/o' is derived from the Latin word 'spiro,' which means 'to breathe.' This root is commonly associated with processes related to breathing or respiration.
3. Step 3: Compare the given options: Digestion, Breathing or respiration, Cell division, and Movement. Identify which option aligns with the meaning of 'spir/o.'
4. Step 4: Eliminate options that do not relate to breathing or respiration. For example, digestion involves the breakdown of food, cell division refers to the process of mitosis or meiosis, and movement pertains to locomotion or muscle activity.
5. Step 5: Conclude that the correct association for 'spir/o' is breathing or respiration, as it directly corresponds to the root's meaning.