Hua Jia won't talk as long as there is danger. So if you want to see if it is alive, don't always touch it, put it in salt water, then let it stand still and come back later.
3, when the market buys, it is necessary to decide whether to live or die. When you take it home, basically those little creatures will die. It's hard to spit sand at home. In fact, what the market buys is artificially raised, which is relatively clean.
I suggest you choose an open one when you buy it.