All cnidarians can regenerateallowing them to recover from injury and to reproduce asexually. Retrieved 4 April Medusae swim by a form of jet propulsion: To return to automatic time zone, please select the top item in the list. These mass spawnings may produce hybridssome of which can settle and form polyps, but it is not free sinhala sex. how long these can survive. Fundamentals of Aquatic Ecology.