It is dead and must be discarded (unless it closes up quickly when tapped). Do not cook open clams, it is a health hazard.
If a clam does not open when cooked, that usually means the clam was dead before cooking. Do not eat clams that won't open when cooked. Make sure that the clams have plenty of space to open during the cook. Sometimes the weight on top will prevent opening.
I am not sure how to get a clam to open naturally. The way I have known to open a clam is by hand.
"Clam up" means to become quiet or refuse to speak, usually due to feeling nervous, secretive, or defensive.
YES
You have to go underwater which is left to Aphrodite and you have to find a clam. It opens and closes. Try to get the pearl (which is inside the clam) when the clam is open.
the mussel of the clam keeps the shell together. But they can open it if the want.
If it doesn't open when you steam it.
Open
you get the pin that is by the clam
yes
An open circulatory system.
On the beach