SIMPLE INVERTEBRATES
MOLLUSKS AND ANNELID WORMS
ARTHROPODS
ECHINODERMS
CHALLENGE
100
Animals that don't have backbones.
What is and INVERTEBRATE
100

ating body part.

What is a SEGMENT?

100
A hard outer covering.
What is an EXOSKELETON?
100
A hard and bony or stiff and flexible internal skeleton.
What is an ENDOSKELTON?
100
One million invertebrates have been named and biologists believe millions more have not been identified.
What is 96% of the animal kingdom?
200
A concentrated mass of nerve cells controlled by the brain.
What is a GANGLION?
200
The most familiar annelid worm.
What is an EARTHWORM?
200
An eye that is made up of many identical, light-sensitive units.
What is a COMPOUND EYE?
200
Meaning "spiny skinned" due to spines on the animals skeleton.
What is an ECHINODERM?
200
Wormlike creatures with many legs.
What are CENTIPEDES?
300
A pouch lined with cells that release chemicals that break down food into small particles, located inside a coelom.
What is a GUT?
300
The two types of circulatory systems in Mollusks.
What are open and closed circulatory systems?
300
A feeler that senses touch, taste, or smell.
What is an ANTENNA?
300
An echinoderm that had bilateral symmetry as a larva and redial symmetry as and adult.
What is a SEA URCHIN?
300
Arthropods with one set of antennae, compound eyes, and mandibles.
What are INSECTS?
400
The three basic body plans, or type of symmetry, of all simple invertebrates.
What are bilateral symmetry, redial symmetry and asymmetrical?
400
The three major classifications of Mollusks.
What are GASTROPODS, BIVALVES and CEPHALOPODS?
400
Changing form as an organism develops.
What is METAMORPHOSIS?
400
The one characteristic that is unique to echinoderms and is a system of canals filled with fluid.
What is a WATER VASCULAR SYSTEM?
400
Ocean animals with gills, mandibles, and two pairs of antennae.
What are CRUSTACEANS?
500
An organism that invades and feeds on the body of another living organism, or host.
What is a PARASITE?
500
The four body parts of all Mollusks.
What are the FOOT (headfoot), VISCERAL MASS, MANTLE, and SHELL?
500
The three parts of an insects body.
What are the HEAD, THORAX, and ABDOMEN?
500
Sea Stars, Brittle and Basket Stars, Sea Urchins and Sand Dollars, Sea Lillies and Feather Stars, and Sea Cucumbers.
What are the FIVE MAJOR CLASSES of echinoderms?
500
Arthropods with no antennae, simple eyes, and chelicerae.
What are ARACHNIDS?
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