Animal kingdom
Grouping of all living beings with more or less complex organs, with which they move about and feed themselves; the body of knowledge about them.
MOLLUSKS
Land and aquatic invertebrates (more than 100,000 species) with soft nonsegmented bodies; they usually secrete a calcareous shell.
snail
Hermaphrodite herbivore land mollusk having a spiral shell; some species of snails are edible.
univalve shell
Land or aquatic mollusk having a foot and head, which retract into a spiral shell made of a single piece.
bivalve shell
Aquatic mollusk without a defined head but having a foot, which retracts into a shell formed of two interarticulated parts.
