What does the diagram below reveal about the connections between photosynthesis and cellular respiration?

The diagram shows the connection of how they need each other in order to work. Photosynthesis needs Cellular Respriation because Cellular respiration  produces carbon dioxide and in order to give out oxygen it needs carbon dioxide. And in order to produce carbon dioxide the cellular respiration need oxygen from the photosythisis cycle

I hope this helps.

that scientist would be robert hooke