This type of bivalve typically cements itself onto a substrate.
Sea cucumbers (?) their organs to avoid predation.
(?) are clusters of nerve cells located in certain parts of the body.
The exoskeleton of arthropods are made of (?).
Common features of chordates include a vertebral column, pharyngeal pouches, and a (?).
This class of echinoderms are known as sea stars.
Most people would not like members of class Pycnogonida, simply because these organisms are (?).
In most cephalopods, fertilization is (?) so they do not broadcast spawn.
Cephalopods can squirt (?) to avoid predation.
All bivalves lack a (?), but gastropods have this special mouth organ.
Structure in gastropods that holds in moisture and offers protection.
Crustaceans will (?) their entire lives, even in their larval form.
This type of symmetry divides an organism into equal left and right sides.
Verticales
A circulatory system that dumps blood over the organs.
These bivalves (?) can produce byssal threads to secure themselves to a substrate.
A well known example of organism in class holothroidea is the (?)
This type of symmetry is displayed in sea stars.
This class includes crab and shrimp.
This class includes brittle stars.
Common organisms in this class are sea urchins.
Two powerful (?) muscles keep the valves of mollusks closed.
Nudibranchs can incorporate undischarged and undigested (?) into their bodies from hydra they eat.
Sea stars can (?) their stomachs to eat clams.
This class of echinoderms are known as sea lilies.
A bivalve that can bore into rock, coral, or wood using its sharp, tooth-like valves.
The second larval stage of snails that contains a shell.
This class includes snails and nudibranchs.
Horseshoe crabs are referred to as (?) fossils because they have not changed much from their fossilized ancestors.
A mollusk's (?) secretes its shell and is also involved in respiration.
Which planktonic organism resembles a shrimp, has a cephalothorax, and plays a vital role in the food web?
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