Ineed ! i am giving the highest points possible! , i am failing, i just need ! suppose you found a fossil of a clamshell. what can you conclude about the once-living organism and how it became a fossil?

The organism was once a clam and most likely became a fossil after being buried by silt in its watery environment after death. Might need more clarification on what exact answer you need.

You already know what type of fossil it is. It is a sea animal which means you already know the general location of the animal which would of been the beach. It is possible to determine how it became a fossil since you can assume that it was either washed up on shore or buried by another animal. Clams generally live for about 400 years so in order for it to be a fossil it would have had to of been dead a long time ago which would be more than 400 years. It could of been around in the Silurian period or the Devonian period since that is when clams practically ruled the oceans. 252 million years ago is when clam like organisms were dominant so you have the general time it could of been around.