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    Biology Today and Tomorrow
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    Exam 21: Circulation and Respiration
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    Circulatory Systems
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Circulatory Systems

Question 71

Question 71

Multiple Choice

Circulatory systems


A) are found in all animals.
B) result in slow distribution of nutrients and gases.
C) include one or more hearts.
D) are always closed systems.
E) are all of these.

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