soft-bodied, boneless water creatures
contains internal organs
a skinlike organ which covers the visceral hump, and in most species, produces a calcium carbonate shell for protection
when nacre builds up around an irritant
the hinges that hold together the two shells of a bivalve mollusk
open chamber in which the gills are located
takes water into the mantle cavity to the gills
where water that has passed through the incurrent siphon exits the body
also called univalves - have a single shell
gastropods which look like snails without shells
sea creatures which have brilliant colors and elaborate plumelike gills
a rough, file-like organ in mouth that scrapes food and carries it like a conveyor belt into the digestive tract
only cephalopod with an external shell
spiny-skinned sea animals
a complex system of water-filled tubes that extends throughout the body
the arms of starfish
at the end of each starfish ray
on the underside of starfish rays; appear in two double rows
microscopic invertebrates found in freshwater lakes and ponds
eggs that require no fertilization
a cylindrical body type for coelenterates
a free-swimming, umbrella-shaped body type which has its mouth facing downwards
"flower" of the ocean
when limestone cups of many corals eventually form together into these limestone structures
the opening by which water leaves a sponge
the tiny openings by which water enters a sponge
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