Chemistry

31. What are the major groups of microrganisms? 32. Describe the characteristics of coke?33. Give two example to show that plastics

31. What are the major groups of microrganisms?
32. Describe the characteristics of coke?33. Give two example to show that plastics are non – corrosive in nature?34. Define acid rain.35. What is metamorphosis?38. Define cataract.​

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