How do the processes of cellular respiration and photosynthesis complement each other?

There are different organisms that carry out these processes and it forms a harmonious cycle where both these processes work hand in hand. (ex. Oxygen is made and then used by another organism via cellular respiration making carbon dioxide. then that same carbon dioxide is used by another organism via photosynthesis to create oxygen)

The short-term effect of tar on the body is increased blood pressure.