Worms with a well-developed circulatory system (including five pairs of hearts) are:
A) platyhelminths.
B) annelids.
C) echinoderms.
D) nematodes.
E) eels.
Correct Answer:
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Q26: Which of these groups is characterized by
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Q28: Hydrae, anemones, and jellyfish are in the
Q29: An animal like a grasshopper can conserve
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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
Q36: Which of these groups is characterized by
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