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    Essential Biology Study Set 2
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    Exam 23: Circulation and Respiration
  5. Question
    Animals Need O₂ Because It ________
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Animals Need O₂ Because It ________

Question 47

Question 47

Multiple Choice

Animals need O₂ because it ________.


A) plays a role in obtaining energy from food
B) helps animals synthesize proteins
C) is necessary to make CO₂
D) is needed to deliver hemoglobin to the cells of an animal's body

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