A marine ecosystem is a complex community of living organisms and their environment in oceanic waters. It includes various habitats such as coral reefs, open oceans, and coastal areas. Key components of these ecosystems are fish, marine mammals, plankton, and seaweed, all of which interact with each other and their surroundings. These ecosystems play a crucial role in regulating the Earth's climate and supporting biodiversity. They provide essential services, such as oxygen production and carbon dioxide absorption, while also serving as a source of food and livelihood for millions of people worldwide. Protecting marine ecosystems is vital for maintaining ecological balance.