What release oxygen during the day but not at night?\nOptions:\n- (A) sea anenomes\n- (B) Organic compounds\n- (C) orange trees\n- (D) coral\n- (E) power stations\n- (F) humans\n- (G) swamp vegetation\n- (H) important habitats Let's solve this problem gradually.

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Plants release oxygen during the day but not during the night. All orange trees are plants. Orange trees release oxygen during the day but not at night. So the final answer is (C).
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