Freshwater systems include rivers, lakes, ponds, and wetlands, which are vital for drinking water, agriculture, and biodiversity. These ecosystems support a variety of life forms, including fish, amphibians, and plants, and play a crucial role in the water cycle by filtering and storing water. Marine systems encompass oceans, seas, and coastal areas, covering about 71% of the Earth's surface. They are home to diverse organisms, from tiny plankton to large whales, and are essential for global climate regulation, oxygen production, and food supply. Both freshwater and marine systems are interconnected and vital for sustaining life on Earth.