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A mollusk's exoskeleton is composed of chitin (a component of the exoskeleton of most animals) and conchiolin which is a form of calcium carbonate (present in snail shells). These complex proteins are secreted by the mantle layer present right below the shell and hardens over time as the creature grows.
What else can I help you with?
What characteristics do all mollusks share that separate this phylum from other phyla in the kingdom animalia?
All mollusks possess a soft body covered by a hard shell, a muscular foot for movement, and a mantle that secretes the shell. These characteristics distinguish mollusks from other phyla in the animal kingdom.
What covers mollusks bodys?
Mollusks have soft body and hard shells but some don't even have shells.
Do mollusk have a hard outer shell?
no..... slugs are mollusks and they don't have a shell
Does mollusks protect themselves?
Most of Mollusks protect themselves with help of shell . Shell is hard protective covering made up of CaCO3. Cephalopods are not protected by shell .
What is the name of the hard shell of crabs and toitoises?
The hard shell of a lobster is known as the chitin.
What kind of mullusks do not have backbones?
Mollusks without backbones are called invertebrates. Some examples of invertebrate mollusks include snails, clams, octopuses, and squid. These animals have soft bodies and are protected by a hard external shell or by their muscular structure.
What time period did hard shell mollusks appear?
545 million years ago
What would a mollusks hard shell help it to do?
Protect against predators trying to eat it.
What is the function of the hard external shell in mullucks?
The hard shell protects the very soft body of the mollusk.
Does a crab have an external or external skeleton?
A crab has an external hard shell, and is an invertebrate.
Can a calm have hard external skeleton?
I assume calm means clam? In which case, a clam does have a hard external (skeleton?) shell of calcium carbonate. The shell is known as an exoskeleton.
Is it true that mollusks with a hard outer shell are invertebrates?
Yes, they are invertebrates as they don't have a spine or an internal skeleton.
