Final answer:
More cells divide in stomach and ovary tissue due to their high turnover rate and active functions in digestion and reproduction, respectively, while lung tissue cells are more durable and divide less frequently.
Step-by-step explanation:
The reason there are more cells dividing in the stomach and ovary tissue than in lung tissue is related to the differing functions and regeneration needs of these tissues. The stomach lining is constantly exposed to harsh conditions such as acidic gastric juices, which damage the cells. Consequently, these cells have a high turnover rate and must be replaced frequently.
On the other hand, the ovary tissue is involved in the production of eggs and hormones, processes that require active cell division. In contrast, lung tissue consists largely of specialized cells for gas exchange that do not divide as often; they are designed to be durable over longer periods. Damage to lung cells is less frequent except in cases of injury or disease.