some animals such as clams have hard shells to protect them. sometimes if a predator sees a sheel it will either think it's a rock, but even if they dont think its a rock they will struggle to get the clam out of the shell even though some animals are able to.
Mollusks are soft bodied animals that can have no shells,1 shell or even 2 shells. Snails, clams, sea slugs, clams, scallops, oysters, octopuses, and squid, are some types of Mollusks.
clams,oyster, and clams
Turtles, snails, crabs, clams, oysters, shrimp, mussels, and eggs have shells because the creature can't protect themselves and Tom Fernanders otherwise many predators would simply attack the animal and eat it.
There are many animals that do indeed have a hard shell, but it depends upon your definition of a shell. In the group of animals called arthropods some possess an exoskeleton (the skeleton on the outside of their body as sort of a protective shell) which would include grasshoppers and cockroaches. Crabs, shrimp, crayfish, and lobsters, are also arthropods and their hard shells are also an exoskeletons. In the group termed mollusks we also see animals with true hard shells, included in this category are snails, clams, scallops, oysters, tusk shells, chitons, nautilus, to name a few. Shelled animals everyone is familiar with is in the reptiles and that is the turtles and tortoises. As far as mammals the only animals which would have what some consider a protective shell (or armor) would be an armadillo.
to Potter
Clams obviously live in the clam shells, sea slugs live in the spirial shells. Some of their organs actually form inside the shell. Also, once those die, sometimes hermit crabs take over the shell when they out grow their previous shell. crabs, mollusks, oysters, mussels, clams, scallops, and other creatures
Some animals that eat clams are crabs, snails, monkeys, too.
Because, people catch clams and then they eat them and sell their shells too make lots of money off of them.
One clam opens it shell. Then the next. Then the male clam sticks it "tongue" in the female clams mouth. Then the female and male shut their shells. Then they start to do a "dance" Then they release their shells and continue as normal.
many do..... tortoise, crab, snail, lobster, turtle, porpose,
Calcium - it's what gives bones and shells their strength.
The radula (or some form of the radula) is found in all classes of mollusks except bivalves (organisms with two shells such as clams).