What substances are involved in two interrelated metabolic processes in plants

What substances are involved in two interrelated metabolic processes in plants – respiration and photosynthesis? How are they formed?

Take, for example, a plant and a person. A person, as we know, breathes oxygen, which plants emit and instead exhales carbon dioxide, which in turn is needed by the same plants, so that when photosynthesis occurs, they can again release oxygen for humans. This metabolism is very important for plants, as it allows them to maintain their vitality and not freeze ahead of time. And yes, they also need sunlight for photosynthesis.