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How do simple organisms exchange substances? O A. Directly across the alveoli. OB. Through spiracles. C. Directly across the external membranes. D. Through specialized gas exchange systems.
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How do simple organisms exchange substances?

O A. Directly across the alveoli.
OB. Through spiracles.
C. Directly across the external membranes.
D. Through specialized gas exchange systems.

User Cyrus Mohammadian
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The answer is D. Through specialized gas exchange systems.
User Tod
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