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Read the following paragraph and point out its topic sentence, supporting sentences and concluding sentence.The forest is a sanitary agent. It is constantly eliminating impurities from the earth and the air. (1) Trees check, sweep, and filter from the air quantities of filthy, germ-laden dust.(2)Their leaves absorb poisonous gases from the air.(3)Roots give off acids, and these acids, together with the acids released by the fallen, decaying leaves, have a sterilizing effect upon the soil.(4)Trees help to keep the earth sweet and clean, and water which comes from a forested watershed is likely to be pure.(5)Many unsanitary areas have been redeemed and rendered healthy by trees planting.(6)
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