A
Matching
The simplest invertebrates
Sponges
Multiple Choice
Which of the following organisms has an endoskeleton?
a. sea urchin
b. sponge
c. jellyfish
d. snail
Sea Urchin
Multiple Choice
What kind of circulatory system pumps blood into sinuses?
a. open circulatory system
b. water vascular system
c. closed circulatory system
d. open vascular system
Open Circulatory System
Matching
ocean animals with gills, mandibles, and two pairs of antennae...
Crustaceans
Matching
arthropods with one set of antennae, compound eyes, and mandibles...
Insects
Multiple Choice
When the two sides of an animal’s body mirror each other, it is called...
a. radial symmetry
b. bilateral symmetry
c. asymmetry
d. segmented symmetry
Bilateral Symmetry
Matching
Planarians, flukes, and leeches
Flatworms
Multiple Choice
Which kind of animal changes its symmetry as it becomes an adult?
a. flatworm
b. echinoderm
c. annelid worm
d. arthropod
Echinoderm
Matching
Gastropods, bivalves, and cephalopods
Mollusks
Matching
arthropods with no antennae, simple eyes, and chelicerae...
Arachnids
Multiple Choice
Which of the following is NOT a stage of complete metamorphosis?
a. egg
b. larvae
c. adult
d. nymph
Nymph
Multiple Choice
What can a compound eye detect?
a. an image
b. more light
c. darkness
d. vibrations
An Image
Matching
The most familiar annelids
Earthworms
Multiple Choice
Where do most animals digest food?
a. vascular system
b. gut
c. circulatory system
d. visceral mass
Gut
Multiple Choice
Which of the following is NOT a function of neurons?
a. carrying messages
b. helping animals sense the environment
c. digesting food
d. helping animals move
Digesting Food
Multiple Choice
What is an exoskeleton?
a. hard external structure
b. loose frame
c. soft internal structure
d. brittle shell
Hard External Structure
Matching
All have jointed limbs
Arthropods
Multiple Choice
Which of the following is NOT sensed by a tarantula’s bristles?
a. pressure
b. motion
c. chemicals
d. an image
An Image
Matching
Organisms whose body forms can include medusa and polyp
Cnidarians
Matching
wormlike creatures with many legs...
Centipedes
Matching
All have chelicerae and a cephalothorax
Arachnids
Multiple Choice
What is the spiny part of an echinoderm?
a. chelicerae
b. mandibles
c. skeleton
d. skin
Skeleton
Multiple Choice
Which of the following can be a parasite?
a. an earthworm
b. a fluke
c. a sea cucumber
d. a centipede
A Fluke
Multiple Choice
All arthropods have specialized parts, jointed limbs, an exoskeleton, and...
a. a well-developed nervous system.
b. antennae.
c. wings.
d. mandibles.
A well-developed nervous system
Matching
Organisms that go through incomplete metamorphosis
Grasshoppers