Cell theory states that cells are the basic morphological and functional units for the maintenance of life, that is, all living beings must be formed by cells, so it is impossible for a living being without at least one cell in its constitution. . This concept explains our body's need to replace the cells that we lost for some reason.
In that case, we can say that cell theory states that cells are the basic unit of life and this supports the idea that a new cell will replace damaged cells in a scratched knee.
Answer - They take in C02 (Carbon Dioxide) & Release O2 (Oxygen)
Reasoning - To be able to do Photosynthesis they Plants need C02 which is one of the important components to making Glucose. During that gas exchange they release O2 for C02.
