The best answer includes two types of movement vertical which is accomplished by extending the foot into the sand or mud. The anterior end of the foot can be spread like a phalange and then the shell is pulled toward that direction. Most movement of adult clams is vertical. Clams in the surf use a type of jet propulsion by forcing water out of the shell cavity which sends the clam in the opposite dirction.
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The clam has a tongue like appendage that it slips through a lightly opened shell, and with this pulls itself.
They move by using a muscular "foot" to propel them across the sand on the ocean floor. They dig their feet into the sand so that they do not drift by the ocean currents.
A Clam filters out its organic food from the water. This is the same way Barnacles and Sponges feed.
it doesn't move. it picks one spot and it mounts itself there and stays for the rest of their life.
They use a muscular foot to move around on the floor of the lake or stream or something.
A clam moves and buries itself in the sand by using a foot that clams have. The foot comes out of the shell so that they are able to move.