A circulatory system that keeps blood confined within vessels after leaving the heart is
A) a closed circulatory system.
B) a gastrovascular cavity.
C) an open circulatory system.
D) an incomplete circulatory system.
E) a complete circulatory system.
Correct Answer:
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A)NematodA.
B)Annelida.
C)Platyhelminthes.
D)Porifera.
E)Cnidaria.
Q34: What are the three major body regions
Q40: Spiders and scorpions belong to the phylum
A)CnidariA.
B)Echinodermata.
C)Annelida.
D)Mollusca.
E)Arthropoda.
Q44: The function of vertebrae is to
A) protect
Q46: An animal that maintains its body temperature
Q54: An animal whose body temperature tends to
Q54: Sea cucumbers and sea urchins belong to
Q57: Which of the following is NOT a
Q59: A circulatory system in which the heart
Q60: Which of the following is NOT a
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