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To survive, all biotic organisms need all of these except?
The word 'muscular foot' is commonly used to describe which group of animals?
Which animal uses protein rods for their skeletal structure?
Which of these would an arthropod NOT do to protect itself immediately after it molts?
Why does an arthropod need to molt?
What happens to an arthropod's exoskeleton after molting?
Which of these is a mollusk without a shell sometimes found in gardens?
What does a sea urchin use for movement and feeding?
What protects a sea urchin from predators?
How does a sea urchin breathe?
What do sea urchins primarily eat?
List or describe two ways in which a bivalve can protect itself when it closes its shells.
List two ways earthworms help plants grow.
What type of exoskeleton does a spider have?
What characteristic feature do cnidarians share?
Which of the following is not a characteristic of arthropods?
What category of animals do flatworms and roundworms belong to?
How do echinoderms usually move?
What type of digestive system does a roundworm have?
What type of animals are classified as cnidarians?
What is a key feature of an insect’s physical structure?
What is the term for a skeleton that is outside of an animal's body?
What type of skeleton does an insect have?
Which statement about parasites is incorrect?
What type of worm has only a single opening to its digestive system?
Which one of these is not a water breathing method
Which type of animal can extract oxygen from water through its skin?
Which of the following is an example of an echinoderm?
mollusks move their muscular feet to
Which of these is not typical of invertebrates?
What is common in echinoderms but not in mammals?
What group do animals like worms, snails, and octopus belong to?
Which of the following is an invertebrate?
Why don't invertebrates have a backbone?
Animals that have backbone are also known as ____?
What is radial symmetry in biological organisms similar to?
Which animal group does a starfish belongs to?