Aquatic plants breathe oxygen dissolved in water. Oxygen enters them through the entire surface of the body through diffusion, i.e., transport along the concentration gradient. Some aquatic plants, such as a water lily, have air cavities that allow air to pass to organs and tissues and keep the plant in the water column.
Ground plants use atmospheric oxygen for breathing through the stomata of leaves and green shoots, the skin of young roots, and the lentils of tree stems.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.