Final answer:
Plants in an aquarium provide numerous benefits, including water storage, erosion prevention, nutrient removal, and habitat creation.
Step-by-step explanation:
Plants are good to have in an aquarium because they provide several benefits. They store excess water from floods, slow down runoff and prevent erosion, remove excess nutrients from runoff, provide a unique habitat for certain plant communities, and offer a safe habitat for many animal species, resulting in high biodiversity. Additionally, they add oxygen and absorb carbon dioxide, helping maintain the atmosphere, and contribute to the purification of water in rivers and lakes. Aquatic plants also have adaptations that allow them to thrive in a watery habitat, such as not needing extensive root systems or thick cuticles on leaves.