What are some symbiotic relationships for sand dollars?

Answer 1

Sand dollars, a type of sea urchin, engage in symbiotic relationships primarily with certain species of algae and small invertebrates. Algae can attach to their surfaces, providing camouflage and potentially aiding in nutrient acquisition through photosynthesis. Additionally, small organisms like shrimp or fish may inhabit the crevices of sand dollars for protection, while benefiting from the sand dollar's presence as a stable habitat. This mutualistic interaction enhances survival and resource access for both parties involved.