If you put it in the refrigerator for a while, what will open is alive, and what won't open is dead. Because the closed area of white clams in the refrigerator will be paralyzed by the drop in temperature, the closed area will be numb, it will open itself and die. The other is to purify it in seawater, and all the flowers are alive. If you want seawater, clean water or tap water, because the salinity of water is different, the sandfly will feel the outside environment is different and will not speak. There is no way to tell whether it is dead or alive. If you want to clean it, use clean seawater to purify it, which is the cleanest. My wife did this experiment at school before.