16. Which of the following does not affect the rate of photosynthesis
17. Which of the following is a waste product of respiration
18. Which of the following is NOT a product of photosynthesis
19. Which of the following is NOT needed in order for photosynthesis to take place
20. Which one of the following is a product of photosynthesis (some is used inside the plant for respiration but most is not needed and is given out as a waste product)
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