How can you prove that plants breathe?

First, if the plants did not breathe, they would not grow, but wilted. Secondly, if the plants did not breathe, then people would not breathe either, since we breathe in carbon dioxide, and we breathe out oxygen, but in plants the opposite is true – they breathe in oxygen and breathe out carbon dioxide. There is a relationship between people and plants.
To prove that the plant’s organs are breathing, you need to pluck a few leaves and partially immerse them in a glass of water. After a while, air bubbles will appear on the surface of the petals. Just as proof, look at the leaf under a microscope, you will see that there are pores.