Which of these groups is characterized by having no body cavity?
A) roundworms
B) annelids
C) arthropods
D) chordates
E) cnidarians
Correct Answer:
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Q31: Worms with a well-developed circulatory system (including
Q32: Sponges have:
A)a gastrovascular cavity.
B)spicules.
C)a nerve net.
D)muscles.
E)an exoskeleton.
Q33: Flatworms lack:
A)a respiratory system.
B)a reproductive system.
C)a nervous
Q34: Ecdysozoans:
A)have trochophore larva.
B)include mollusks, annelids, and flatworms.
C)have
Q35: A(n)_ provides support and protection to arthropods.
A)cytoskeleton
B)exoskeleton
C)hydrostatic
Q37: Which of these groups is characterized by
Q38: _ are characterized by having a pseudocoelom.
A)Roundworms
B)Annelids
C)Arthropods
D)Chordates
E)Cnidarians
Q39: The phylum Nematoda includes which of the
Q40: A cnidarian that builds a calcium carbonate
Q41: Which of the following animals are arachnids?
A)spiders
B)wasps
C)grasshoppers
D)flukes
E)beetles
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