WAEC Biology 2018 Theory — Question 16

Question 16 of 19 from the West African Examinations Council (WAEC) Biology 2018 Theory paper, with the correct answer and a full explanation.

6.(b) List three gases in the atmosphere with their percentage composition.

Model answer

Nitrogen ≈ 78%, Oxygen ≈ 21%, Carbon (IV) oxide ≈ 0.03% (Rare/other gases ≈ 0.97%).

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