When you buy fresh clams, you can see that they will spray water with their slender tongues, and you can see one opening after another during cooking, so when you buy fresh and cooked clams, there will be a few without openings, which is normal. If most of them don't open their mouths, it is recommended not to eat them. I hope you can carefully identify and buy fresh clams every time.

1, open when drowning is unbearable to be scalded.

2. When frying, it is closed because the tissue inside shrinks and the lid is closed.

Its two shells are connected by the muscle that contains bones. When heated, the muscle contracts, so the shells are separated, so it opens its mouth.