WAEC Biology 2018 Objective — Question 12
Question 12 of 50 from the West African Examinations Council (WAEC) Biology 2018 Objective paper, with the correct answer and a full explanation.
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Which of the following substances is not an excretory product of animals?
- A. carbon dioxide
- B. urea
- C. sweat
- D. oxygenCorrect
Explanation
Oxygen is not excreted by animals as waste — it is a by-product released by plants during photosynthesis.
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