Choose any freshwater ecosystem (Section 7.2) or saltwater ecosystem (Section 7.8). Describe it in terms of the characteristics of the water body (fresh or salt, flowing or still, vertical zonation, etc.), and its plant and animal life. Have humans caused any negative impacts in this type of ecosystem? Give an example of how humans have impacted this ecosystem and the environmental problems we may have caused.

In your responses to others, suggest what we can do to lessen or eliminate negative human impacts.