Name and describe the roles of the three main trophic categories (file attached)

1. Name and describe the roles of the three main trophic categories that make up the biotic structure of every ecosystem. Give examples of organisms from each category.

2. Describe the hydrologic cycle and how water moves through this cycle

3. What is the tragedy of the commons?

4. Alternative energies include solar, wind, geothermal, and tidal power. Choose two of these sources and outline the positive and negative aspects of each.

Tidal energy:

Wind Energy: