Why do aquatic animals have special coverings?

Aquatic animals have special coverings, such as scales, shells, or skin, to protect them from environmental hazards like predators and harsh water conditions. These coverings also help to reduce water loss and enable better movement through water. Additionally, many coverings provide camouflage or help with buoyancy, which are crucial for survival in aquatic habitats. Overall, these adaptations enhance their ability to thrive in diverse underwater ecosystems.