Marine environments refer to the vast bodies of saltwater that cover about 71% of the Earth's surface. These environments include oceans, seas, coral reefs, and estuaries, each hosting diverse ecosystems. Marine life ranges from tiny plankton to large whales, and these habitats are crucial for global biodiversity and climate regulation. The ocean is divided into different zones based on depth and light penetration, such as the intertidal zone, neritic zone, and abyssal zone. Each zone supports unique organisms adapted to specific conditions. Marine environments also play a vital role in human activities, including fishing, shipping, and recreation.