Answer:
my guess would be neither because its just saying "cancerous" not which type but im not sure..
Explanation:
Answer: Helps the plant breathe: The epidermis of the leaf contains guard cells that control and regulate the small pores on the undersurface of the leaves. These pores are called stomata. Stomata are responsible for regulating water in and out of the cell. It is also responsible for the exchange of gases across the epidermis.
You can further understand a text if you ask questions.
It is found in the cell walls of plants.