Final answer:
The subject of this question is Geography, specifically the Chesapeake Bay. The bay is facing a decline in its ecosystem due to pollution and excess nutrients from fertilizer runoff. Stakeholders need to work together to address and solve this problem.
Step-by-step explanation:
The subject of this question is Geography. The question is referring to the Chesapeake Bay, which is a natural landmark located in six states. The Chesapeake Bay is experiencing a decline in its ecosystem due to pollution and excess nutrients from fertilizer runoff. This issue requires the cooperation of various stakeholders such as industry, agriculture, and homeowners to address the problem.