1. List some of the most important plant, animal and microorganism products that you use. These products correspond to the arrows from producers, consumers and decomposers to humans, as shown in Figure 8.9. What kinds of ecosystems do the different products come from?

Where are those ecosystems located? In the case of animal and microorganism products, how many steps are there in the food chain leading to a product? What significant products or other services come from an ecosystem as a whole?