clams and earthworms are very different because an earthworm does not breathe through gills or by absorbing oxygen through their skin but all these things clams can do but clams can not live on wet or damp places like some worms can do and earthworms also are segmented worms that is how they are different.
They are alike because they are invertebrates and they are different because one has a shell to protect itself from predators and the other doesn't have anything to protect itself from.
worms
Clams crabs and worms
crabs,worms,clams,small fish, and crustaceans
Crustaceans, worms, small fish and small clams
Crabs, shrimps, worms, clams, and small fishes
Shrimp, Giant clams, and Tube worms
Mussels are a general term used for several different families of clams. Clams that are edible and have an elongated, asymmetrical shell are called Mussels.
Believe it or not, clams eat tube worms and planktonic stuff or plankton. FYI, Not from Spongebob
They will eat worms, small fish, clams, crabs, mollusks and shrimp.
They eat fish,squid,shrimp,octopus,worms,small crabs, and clams
Surely only worms can live in worm water?