Chromists in ocean waters are important for life on Earth because they are key players in the marine food web, producing more than 50% of the oxygen on Earth through photosynthesis. They also serve as the base of the food chain for many marine animals, from tiny shrimp to large whales. Chromists also play a crucial role in regulating the global carbon cycle, which helps stabilize Earth's climate and keep it suitable for life as we know it. Finally, some species of chromists have commercial and medicinal value, making them important for human society as well.
