The diagram below shows two processes, P and Q, in the carbon cycle.
Carbon in
atmosphere
P is an arrow pointing down to a plant and Q is point up to the sky from the plant.
Which of these statements best describes the processes P and Q?
1) P shows decomposition and Q shows diffusion. 2) P shows diffusion and Q shows decomposition.
3) P shows photosynthesis and Q shows respiration.
4) P shows respiration and Q shows photosynthesis.