Final answer:
Both or/o and stomat/o relate to the mouth or oral cavity in biology.
Step-by-step explanation:
In biology, both or/o and stomat/o relate to the mouth or oral cavity.
For example, oral cavity refers to the entire mouth, including the teeth, gums, cheeks, and tongue. On the other hand, stomat/o specifically refers to the mouth when studying the structure or diseases related to it.
Understanding these terms is important in the study of human anatomy and physiology as well as in various branches of medicine such as dentistry and oral surgery.