an event that occurs when something passes from one state or phase to another

an event that occurs when something passes from one state or phase to another

an event that occurs when something passes from one state or phase to another

an event that occurs when something passes from one state or phase to another

an event that occurs when something passes from one state or phase to another

an event that occurs when something passes from one state or phase to another

an event that occurs when something passes from one state or phase to another

an event that occurs when something passes from one state or phase to another

an event that occurs when something passes from one state or phase to another

sessile marine coelenterates including solitary and colonial polyps; the medusoid phase is entirely suppressed