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Marine animals encompass a diverse range of organisms inhabiting Earth's oceans, from microscopic plankton to gigantic whales. They are characterized by their adaptations to survive in aquatic environments, which often involve specialized respiratory, circulatory, and sensory systems. These creatures play crucial roles in maintaining the health and balance of marine ecosystems, including serving as primary producers, decomposers, and apex predators. The study of marine animals, also known as marine biology or ichthyology, seeks to understand their behavior, distribution, evolution, and conservation.