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Vocabulary
Arthropods
Worms
Other Invertebrates
Random Trivia
100
What is an invertebrate?
An animal without a backbone
100
Every arthropod has ________ legs and a hard ___________ that protects the body.
Jointed; exoskeleton
100
What are the three main groups of worms?
Flatworms, roundworms, and segmented worms
100
What is the only invertebrate group that does not have symmetry?
Sponges
100
Out of all animal species on earth, what percentage are invertebrates?
95%
200
The hard outer covering that protects an invertebrate's body is the _______________.
Exoskeleton
200
What is the largest arthropod group?
Insects
200
How many cell layers thick are flatworms?
3 cell layers
200
What are the only mollusks that live on land?
Snails and slugs
200
True or false? "All invertebrates have an exoskeleton."
False!
300
__________ means that parts of an animal's body match up with other parts around a midpoint or central line.
Symmetry
300
True or false? "Scorpions are arachnids."
True!
300
Which worms have a one-way digestive system?
Roundworms
300
Which invertebrate group has an internal skeleton?
Echinoderms
300
All insects have ___ legs.
6
400
What is heredity?
The passing of traits from parent to offspring.
400
Which group of arthropods can chew?
Crustaceans
400
Do worms have bilateral symmetry or radial symmetry?
Bilateral symmetry
400
Name two cnidarians: One that can move and one that can not.
Jellyfish, coral
400
Atlantic blue crabs, like many arthropods, must do what in order to grow bigger?
Shed their exoskeleton
500
What is the opposite of an exoskeleton?
Endoskeleton
500
How does a lobster breathe?
With its gills.
500
If you found a worm living inside of another animal's body, which kind of worm would it NOT be?
A segmented worm
500
Which invertebrate has thousands of teeth, but only one foot?
A snail
500
How many legs would a millipede have if it had fifteen body segments?
60 legs