These are a few mollusks, which include; octopi, clam, squid, snails, and slugs.
Mollusks were among the first inhabitants of the Earth. Fossils of mollusks have been found in rocks and date back over 500 million years. Mollusk fossils are usually well preserved because of their hard shell.
Most mollusks have a soft, skin-like organ covered with a hard outside shell. Some mollusks live on land, such as the snail and slug. Other mollusks live in water, such as the oyster, mussel, clam, squid and octopus.
Mollusks have soft bodies that consist of three basic parts: a foot, a visceral mass and a mantle. Many species also have a protective shell made of chitin, proteins and calcium carbonate.
Most mollusks have a soft, skin-like organ covered with a hard outside shell. Some mollusks live on land, such as the snail and slug. Other mollusks live in water, such as the oyster, mussel, clam, squid and octopus.
Mollusks have soft bodies that consist of three basic parts: a foot, a visceral mass and a mantle. Many species also have a protective shell made of chitin, proteins and calcium carbonate.