This is an example of an ecosystem because it's where us humans live in. We live, interact, and use the environment to our use. We live in this area because we interact with other humans (organisms).
A Starfish is an example of a heterotroph because they get their nutrients from organic substances. A starfish cannot make it's own food so they eat other plants and animals to get their energy. They rely on other animals for their source of food.
This is an example of waste water because it used to clean up dirt chemicals in the water near the Boston Harbor. This helps our water stay clean and healthy