Final answer:
The word root 'or/o' means 'mouth.' The mouth is the opening through which food and water enter the body and is a vital part of the digestive system.
Step-by-step explanation:
The word root or/o does indeed mean "mouth." In biology, the mouth is the opening through which food and water enter the body. It is an important part of the digestive system, as it is responsible for chewing, swallowing, and initiating the digestion process. The mouth also plays a role in speaking and breathing.