Examine the figure below and answer the following questions using the letters below (type, A, B, C, or D in the blanks) a. Which zone has the lowest Biological Oxygen Demand? b. Which zone has the lowest Dissolved Oxygen? c. Which zone has the highest Biological Oxygen Demand? d. Which zone shows the greatest change in Dissolved Oxygen?

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Soil Ecosystem

Soil provides a habitat or living environment for a large number of different species of organisms as well as plants. It provides all the essential nutrients and minerals for plants to grow. All these together form the soil ecosystem.