A. carbondioxide
B. urea
C. sweat
D. oxygen
Correct Answer: Option D
D. oxygen
Explanation
Animals take in oxygen in the respiratory process, taking out carbondioxide.
A. carbondioxide
B. urea
C. sweat
D. oxygen
Correct Answer: Option D
D. oxygen
Explanation
Animals take in oxygen in the respiratory process, taking out carbondioxide.
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