Problem:
Question 1: What is / are the main difference(s) between the leaves of C3 and C4 plants?
Question 2: What is / are the main difference(s) between the leaves of C3 and C4 photosynthesis?
Question 3: How do guard cells regulate the opening of the stomata?
Question 4: What is the basic theory of paper chromatography?
Please give a detailed discription of the following questions.