Where does the exchange of oxygen and nutrients and water occur

Which sequence correctly shows the path of carbon dioxide during repiration?

What evidence supports the law of conservation of energy? a) mechanical energy is converted to chemical energy during photosynthesis. b) oxygen is made from the breakdown of carbon dioxide during photosynthesis. c)energy is absorbed by chlorophyll and becomes chemical energy during photosynthesis. d)the sun gives off light energy that is absorbed by plants.

Were you able to observe the nucleolus in any of the cells if so which ones