At the conclusion of the unit, students select from their portfolios five or six works that illustrate their accomplishments and learning, along with an explanation of why they chose the items they did. Communities, populations, species, habitats, cycles, and food webs include both structural and functional components. Feedback loops within the system drive change over time. Changes in one component of an ecosystem may be far-reaching in their influence on the other components. Aquatic ecosystems are influenced by changes introduced by humans.
Human activities alter aquatic ecosystems.
Human attitudes toward aquatic ecosystems have changed over time. People can choose to protect and restore aquatic ecosystems.